Exception thrown for documentation lookup on hover in IntelliJ

[jackm]

Describe the bug
Got an unhandled exception from the Robot Framework LS plugin for PyCharm/IntelliJ when trying to show keyword documentation on hover.

The exception seems to be originating from method robocorp.lsp.intellij.FeatureHover.getCustomDocumentationElement in FeatureHover.java:37.

To Reproduce
Not 100% certain, but seems to happen after editing a robot file where the static code analysis (code insight) hasn't resynced/rerun fully and when hovering over a keyword in the file.

Expected behavior
No unhandled exceptions thrown.

Versions:

• OS: Linux, Ubuntu 20.04.4 LTS
• Robot Framework Version: 5.0.1
• Robot Framework Language Server Version: 1.0.0
• Client Version: PyCharm 2022.2 Professional, build PY-222.3345.131

Logs
Full stacktrace:

java.lang.NullPointerException: Cannot invoke "com.intellij.psi.PsiElement.getText()" because "contextElement" is null
	at robocorp.lsp.intellij.FeatureHover.getCustomDocumentationElement(FeatureHover.java:37)
	at com.intellij.lang.documentation.CompositeDocumentationProvider.getCustomDocumentationElement(CompositeDocumentationProvider.java:283)
	at com.intellij.codeInsight.documentation.DocumentationManager.customElement(DocumentationManager.java:998)
	at com.intellij.codeInsight.documentation.DocumentationManager.doFindTargetElementAtOffset(DocumentationManager.java:976)
	at com.intellij.codeInsight.documentation.DocumentationManager.findTargetElementAtOffset(DocumentationManager.java:962)
	at com.intellij.codeInsight.documentation.DocumentationManager.findTargetElementAndContext(DocumentationManager.java:904)
	at com.intellij.lang.documentation.ide.impl.IdeDocumentationTargetProviderImpl.documentationTargets(IdeDocumentationTargetProviderImpl.kt:42)
	at com.intellij.lang.documentation.ide.actions.ActionsKt.targetsFromEditor(actions.kt:96)
	at com.intellij.lang.documentation.ide.actions.ActionsKt.documentationTargetsInner(actions.kt:64)
	at com.intellij.lang.documentation.ide.actions.ActionsKt.access$documentationTargetsInner(actions.kt:1)
	at com.intellij.lang.documentation.ide.actions.DocumentationTargetsDataRule.getData(actions.kt:56)
	at com.intellij.lang.documentation.ide.actions.DocumentationTargetsDataRule.getData(actions.kt:54)
	at com.intellij.ide.impl.DataManagerImpl.getRulesData(DataManagerImpl.java:211)
	at com.intellij.ide.impl.DataManagerImpl.lambda$getDataRuleInner$8(DataManagerImpl.java:184)
	at com.intellij.ide.impl.DataManagerImpl.getDataFromRuleInner(DataManagerImpl.java:113)
	at com.intellij.ide.impl.DataManagerImpl.getDataFromRulesInner(DataManagerImpl.java:100)
	at com.intellij.ide.impl.DataManagerImpl.getDataFromRules(DataManagerImpl.java:67)
	at com.intellij.openapi.actionSystem.impl.PreCachedDataContext.getData(PreCachedDataContext.java:166)
	at com.intellij.openapi.actionSystem.DataContext.getData(DataContext.java:42)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.ensureSlowDataKeysPreCached(ActionUpdater.java:429)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$callAction$5(ActionUpdater.java:183)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1154)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.callAction(ActionUpdater.java:183)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.callAction(ActionUpdater.java:153)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.updateActionReal(ActionUpdater.java:129)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$new$0(ActionUpdater.java:116)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.update(ActionUpdater.java:649)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.expandGroupChild(ActionUpdater.java:498)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$doExpandActionGroup$20(ActionUpdater.java:477)
	at com.intellij.util.containers.ContainerUtil.concat(ContainerUtil.java:1398)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.doExpandActionGroup(ActionUpdater.java:477)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.expandGroupChild(ActionUpdater.java:550)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$doExpandActionGroup$20(ActionUpdater.java:477)
	at com.intellij.util.containers.ContainerUtil.concat(ContainerUtil.java:1398)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.doExpandActionGroup(ActionUpdater.java:477)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.expandActionGroup(ActionUpdater.java:272)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$doExpandActionGroupAsync$12(ActionUpdater.java:340)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$doExpandActionGroupAsync$13(ActionUpdater.java:359)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1154)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$tryRunReadActionAndCancelBeforeWrite$17(ActionUpdater.java:391)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runActionAndCancelBeforeWrite(ProgressIndicatorUtils.java:158)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.tryRunReadActionAndCancelBeforeWrite(ActionUpdater.java:387)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$doExpandActionGroupAsync$14(ActionUpdater.java:359)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:188)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$12(CoreProgressManager.java:608)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:683)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:639)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:607)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:60)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:175)
	at com.intellij.openapi.progress.util.BackgroundTaskUtil.runUnderDisposeAwareIndicator(BackgroundTaskUtil.java:365)
	at com.intellij.openapi.actionSystem.impl.ActionUpdater.lambda$doExpandActionGroupAsync$15(ActionUpdater.java:358)
	at com.intellij.util.concurrency.BoundedTaskExecutor.doRun(BoundedTaskExecutor.java:241)
	at com.intellij.util.concurrency.BoundedTaskExecutor.access$200(BoundedTaskExecutor.java:31)
	at com.intellij.util.concurrency.BoundedTaskExecutor$1.execute(BoundedTaskExecutor.java:214)
	at com.intellij.util.ConcurrencyUtil.runUnderThreadName(ConcurrencyUtil.java:212)
	at com.intellij.util.concurrency.BoundedTaskExecutor$1.run(BoundedTaskExecutor.java:203)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:702)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:699)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:699)
	at java.base/java.lang.Thread.run(Thread.java:833)