Fix NPE in LocalRepositorySearcher.findLocalFile

[vrubezhny]

[Error - 4:46:44 AM] Jul 22, 2023 04:46:44 org.eclipse.lemminx.extensions.maven.participants.hover.MavenHoverParticipant collectArtifactDescription()
Message: java.lang.NullPointerException: Cannot invoke "String.replace(char, char)" because the return value of "org.apache.maven.model.Dependency.getGroupId()" is null
java.lang.NullPointerException: Cannot invoke "String.replace(char, char)" because the return value of "org.apache.maven.model.Dependency.getGroupId()" is null
	at org.eclipse.lemminx.extensions.maven.searcher.LocalRepositorySearcher.findLocalFile(LocalRepositorySearcher.java:133)
	at org.eclipse.lemminx.extensions.maven.participants.hover.MavenHoverParticipant.collectArtifactDescription(MavenHoverParticipant.java:394)
	at org.eclipse.lemminx.extensions.maven.participants.hover.MavenHoverParticipant.onText(MavenHoverParticipant.java:145)
	at org.eclipse.lemminx.services.XMLHover.getTextHover(XMLHover.java:214)
	at org.eclipse.lemminx.services.XMLHover.doHover(XMLHover.java:99)
	at org.eclipse.lemminx.services.XMLLanguageService.doHover(XMLLanguageService.java:185)
	at org.eclipse.lemminx.XMLTextDocumentService.lambda$hover$5(XMLTextDocumentService.java:281)
	at org.eclipse.lemminx.commons.ModelTextDocuments.lambda$computeModelAsync$0(ModelTextDocuments.java:118)
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646)
	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)