NPE in classifier info view

[lwrage]

Summary
The following NPE was logged when renaming files/packages with items open in the view.

Expected behavior

No NPE

Actual behavior

NPE in the log:

!ENTRY org.eclipse.core.resources 4 2 2024-01-21 15:23:09.272
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.core.resources".
!STACK 0
java.lang.NullPointerException: Cannot invoke "String.equalsIgnoreCase(String)" because the return value of "org.eclipse.core.resources.IResource.getFileExtension()" is null
	at org.osate.ui.views.ClassifierInfoView$Listener.lambda$0(ClassifierInfoView.java:848)
	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:67)
	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:77)
	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:77)
	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:51)
	at org.osate.ui.views.ClassifierInfoView$Listener.resourceChanged(ClassifierInfoView.java:843)

Steps To Reproduce

Not sure about the exact steps.

Desktop (please complete the following information):

• OSATE Version: 2.14.0 snapshot
• Operating System: Ubuntu