Merging lists in Extender.java may cause a null ptr exception

[mathiaswking]

Presumably, the user config (ext.manifest) is somehow broken, and will cause an unhandled exception.

2018-04-01 11:57:51.357 INFO 16 --- [tp556529265-490] com.defold.extender.Extender : Building engine for platform armv7-android with extension source /tmp/job5295972638235995063/upload
2018-04-01 11:57:51.366 ERROR 16 --- [tp556529265-490] com.defold.extender.ExtenderController : Internal Server Error

java.lang.NullPointerException: null
at com.defold.extender.Extender.isListOfStrings(Extender.java:205) ~[classes!/:na]
at com.defold.extender.Extender.mergeContexts(Extender.java:221) ~[classes!/:na]
at com.defold.extender.Extender.buildEngine(Extender.java:713) ~[classes!/:na]
at com.defold.extender.Extender.build(Extender.java:773) ~[classes!/:na]
at com.defold.extender.ExtenderController.buildEngine(ExtenderController.java:114) ~[classes!/:na]
at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:220) ~[spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) ~[spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116) ~[spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) ~[spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) ~[spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) ~[spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) [javax.servlet-api-3.1.0.jar!/:3.1.0]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [javax.servlet-api-3.1.0.jar!/:3.1.0]
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:845) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1712) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:247) [websocket-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55) [spring-boot-1.4.2.RELEASE.jar!/:1.4.2.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:105) [spring-boot-actuator-1.4.2.RELEASE.jar!/:1.4.2.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:89) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:107) [spring-boot-actuator-1.4.2.RELEASE.jar!/:1.4.2.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.4.RELEASE.jar!/:4.3.4.RELEASE]
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) [jetty-security-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512) [jetty-servlet-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.Server.handle(Server.java:534) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251) [jetty-server-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273) [jetty-io-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95) [jetty-io-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93) [jetty-io-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303) [jetty-util-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148) [jetty-util-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136) [jetty-util-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671) [jetty-util-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589) [jetty-util-9.3.14.v20161028.jar!/:9.3.14.v20161028]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161]

[mathiaswking]

Merged:
48be72d