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Nullpointer Exception in catalog extension

See original GitHub issue

If the client doesn’t send the xml.catalog: [] array setting explicitly upon initialization, the following Nullpointer exception is raised by the Arrays.stream().

lemminx: Aug 01, 2020 3:17:00 PM org.eclipse.lemminx.XMLLanguageServer initialize
lemminx: INFORMATION: Initializing XML Language server
lemminx: LemMinX Server info:
lemminx:  - Version : 0.13.1
lemminx:  - Java : C:\Program Files\Java\jre1.8.0_251
lemminx:  - Git 3c6c0de - [maven-release-plugin] prepare release 0.13.1
lemminx: Aug 01, 2020 3:17:00 PM org.eclipse.lemminx.services.extensions.XMLExtensionsRegistry registerExtension
lemminx: SCHWERWIEGEND: Error while initializing extension <org.eclipse.lemminx.extensions.catalog.XMLCatalogPlugin>
lemminx: java.lang.NullPointerException
lemminx: 	at java.util.Arrays.stream(Unknown Source)
lemminx: 	at org.eclipse.lemminx.extensions.catalog.XMLCatalogPlugin.validateCatalogPaths(XMLCatalogPlugin.java:70)
lemminx: 	at org.eclipse.lemminx.extensions.catalog.XMLCatalogPlugin.doSave(XMLCatalogPlugin.java:47)
lemminx: 	at org.eclipse.lemminx.services.extensions.XMLExtensionsRegistry.registerExtension(XMLExtensionsRegistry.java:201)
lemminx: 	at org.eclipse.lemminx.services.extensions.XMLExtensionsRegistry.lambda$initialize$2(XMLExtensionsRegistry.java:191)
lemminx: 	at java.lang.Iterable.forEach(Unknown Source)
lemminx: 	at org.eclipse.lemminx.services.extensions.XMLExtensionsRegistry.initialize(XMLExtensionsRegistry.java:190)
lemminx: 	at org.eclipse.lemminx.services.extensions.XMLExtensionsRegistry.initializeIfNeeded(XMLExtensionsRegistry.java:180)
lemminx: 	at org.eclipse.lemminx.services.extensions.XMLExtensionsRegistry.getDiagnosticsParticipants(XMLExtensionsRegistry.java:132)
lemminx: 	at org.eclipse.lemminx.services.XMLDiagnostics.doExtensionsDiagnostics(XMLDiagnostics.java:83)
lemminx: 	at org.eclipse.lemminx.services.XMLDiagnostics.doDiagnostics(XMLDiagnostics.java:53)
lemminx: 	at org.eclipse.lemminx.services.XMLLanguageService.doDiagnostics(XMLLanguageService.java:159)
lemminx: 	at org.eclipse.lemminx.services.XMLLanguageService.publishDiagnostics(XMLLanguageService.java:168)
lemminx: 	at org.eclipse.lemminx.XMLTextDocumentService.validate(XMLTextDocumentService.java:466)
lemminx: 	at org.eclipse.lemminx.XMLTextDocumentService.lambda$triggerValidationFor$23(XMLTextDocumentService.java:459)
lemminx: 	at java.util.concurrent.CompletableFuture.uniAccept(Unknown Source)
lemminx: 	at java.util.concurrent.CompletableFuture$UniAccept.tryFire(Unknown Source)
lemminx: 	at java.util.concurrent.CompletableFuture$Completion.exec(Unknown Source)
lemminx: 	at java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
lemminx: 	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(Unknown Source)
lemminx: 	at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
lemminx: 	at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

The ContentModelSettings object should return safe defaults if no catalog is present (empty array instead of null) or validateCatalogPaths() should handle the null return value properly.