Merge pull request #7405 from dibarbet/cherry_pick_completion

cherry pick 7401 to prerelease

Author: dibarbet

src/razor/src/completion/completionHandler.ts

@@ -156,7 +156,10 @@ export class CompletionHandler {
         // TODO: Snippet support
 
         try {
-            if (delegatedCompletionItemResolveParams.originatingKind != LanguageKind.CSharp) {
+            if (
+                delegatedCompletionItemResolveParams.originatingKind != LanguageKind.CSharp ||
+                delegatedCompletionItemResolveParams.completionItem.data.TextDocument == null
+            ) {
                 return delegatedCompletionItemResolveParams.completionItem;
             } else {
                 const newItem = await vscode.commands.executeCommand<CompletionItem>(