symbol.parent really is possibly sometimes undefined here. (#37159)

Fixes #37158

Author: RyanCavanaugh

src/services/rename.ts

@@ -24,7 +24,7 @@ namespace ts.Rename {
         }
 
         // Cannot rename `default` as in `import { default as foo } from "./someModule";
-        if (isIdentifier(node) && node.originalKeywordKind === SyntaxKind.DefaultKeyword && symbol.parent!.flags & SymbolFlags.Module) {
+        if (isIdentifier(node) && node.originalKeywordKind === SyntaxKind.DefaultKeyword && symbol.parent && symbol.parent.flags & SymbolFlags.Module) {
             return undefined;
         }