[backport] NullPointerException: Cannot invoke "org.eclipse.core.resources.IResourceDelta.getResource()" because "resourceDelta" is null

[BoykoAlex]

Port into 4.x #1679

FYI jdt.ls telemetry caught this NPE from spring tools:

java.lang.NullPointerException: Cannot invoke "org.eclipse.core.resources.IResourceDelta.getResource()" because "resourceDelta" is null
at org.springframework.tooling.jdt.ls.commons.classpath.ClasspathListenerManager$MyListener.isClasspathManifestFileChanged(ClasspathListenerManager.java:133)
at org.springframework.tooling.jdt.ls.commons.classpath.ClasspathListenerManager$MyListener.visit(ClasspathListenerManager.java:81)
at org.springframework.tooling.jdt.ls.commons.classpath.ClasspathListenerManager$MyListener.visitChildren(ClasspathListenerManager.java:162)
at org.springframework.tooling.jdt.ls.commons.classpath.ClasspathListenerManager$MyListener.visit(ClasspathListenerManager.java:73)
at org.springframework.tooling.jdt.ls.commons.classpath.ClasspathListenerManager$MyListener.lambda$0(ClasspathListenerManager.java:65)
at org.springframework.tooling.jdt.ls.commons.classpath.ClasspathListenerManager$1.run(ClasspathListenerManager.java:50)

https://github.com/spring-projects/spring-tools/blob/7acff8d33667db723403a3e376f7b135d832aa82/headless-services/jdt-ls-extension/org.springframework.tooling.jdt.ls.commons/src/org/springframework/tooling/jdt/ls/commons/classpath/ClasspathListenerManager.java#L133C6-L133C62

I don't have any more context to provide or steps to reproduce.

[BoykoAlex]

Fixed via 0eeca35