NPE during Qute validation when project is not available

[angelozerr]

When validation is triggered for Qute template (ex : a classpath changed is done) and the Qute project is not ready, there is the following NPE:

SEVERE: Error while validating expression '"Qute"' in 'file:///C:/Users/azerr/git/code-with-quarkus/src/main/resources/templates/page.qute.html'.
java.lang.NullPointerException
	at com.redhat.qute.services.QuteDiagnostics.validateExpression(QuteDiagnostics.java:560)
	at com.redhat.qute.services.QuteDiagnostics.validateMethodPart(QuteDiagnostics.java:973)
	at com.redhat.qute.services.QuteDiagnostics.validateMemberPart(QuteDiagnostics.java:819)
	at com.redhat.qute.services.QuteDiagnostics.validateExpressionParts(QuteDiagnostics.java:645)
	at com.redhat.qute.services.QuteDiagnostics.validateExpression(QuteDiagnostics.java:573)
	at com.redhat.qute.services.QuteDiagnostics.validateDataModel(QuteDiagnostics.java:310)
	at com.redhat.qute.services.QuteDiagnostics.doDiagnostics(QuteDiagnostics.java:196)
	at com.redhat.qute.services.QuteLanguageService.doDiagnostics(QuteLanguageService.java:161)
	at com.redhat.qute.ls.template.TemplateFileTextDocumentService.triggerValidationFor(TemplateFileTextDocumentService.java:388)
	at com.redhat.qute.ls.template.TemplateFileTextDocumentService.lambda$validateAllTemplates$26(TemplateFileTextDocumentService.java:424)
	at java.base/java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1693)
	at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658)
	at com.redhat.qute.ls.template.TemplateFileTextDocumentService.validateAllTemplates(TemplateFileTextDocumentService.java:423)
	at com.redhat.qute.ls.template.TemplateFileTextDocumentService.dataModelChanged(TemplateFileTextDocumentService.java:373)
	at com.redhat.qute.ls.QuteTextDocumentService.dataModelChanged(QuteTextDocumentService.java:310)
	at com.redhat.qute.ls.QuteLanguageServer.dataModelChanged(QuteLanguageServer.java:299)
	at jdk.internal.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:65)
	at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.notify(GenericEndpoint.java:152)
	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleNotification(RemoteEndpoint.java:220)
	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:187)
	at com.redhat.qute.ls.commons.ParentProcessWatcher.lambda$apply$0(ParentProcessWatcher.java:148)
	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:194)
	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:94)
	at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:113)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)