NPE on renaming a namespaced tag with no corresponding ending tag

[rgrunber]

eg. <xs:foo> with no corresponding tag. Looks like this was the same in previous releases, so not a regression.

stacktrace

SEVERE: Internal error: java.lang.NullPointerException: Cannot invoke "org.eclipse.lsp4j.Range.getStart()" because "endTagRange" is null
java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "org.eclipse.lsp4j.Range.getStart()" because "endTagRange" is null
    at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
    at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
    at java.base/java.util.concurrent.CompletableFuture.biApply(CompletableFuture.java:1313)
    at java.base/java.util.concurrent.CompletableFuture$BiApply.tryFire(CompletableFuture.java:1280)
    at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)
    at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
    at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
    at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655)
    at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622)
    at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)
Caused by: java.lang.NullPointerException: Cannot invoke "org.eclipse.lsp4j.Range.getStart()" because "endTagRange" is null
    at org.eclipse.lemminx.services.XMLRename.getTagNameRenameTextEdits(XMLRename.java:190)
    at org.eclipse.lemminx.services.XMLRename.getRenameTextEdits(XMLRename.java:105)
    at org.eclipse.lemminx.services.XMLRename.doRename(XMLRename.java:87)
    at org.eclipse.lemminx.services.XMLLanguageService.doRename(XMLLanguageService.java:240)
    at org.eclipse.lemminx.XMLTextDocumentService.lambda$rename$10(XMLTextDocumentService.java:352)
    at java.base/java.util.concurrent.CompletableFuture.biApply(CompletableFuture.java:1311)
    ... 7 more