fix(core): error when delete tags (#13207)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Refactor**
* Adjusted the placement of a conditional check to improve code
organization. No changes to user-facing functionality.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/desktop/pages/workspace/tag/index.tsx

@@ -109,11 +109,6 @@ export const TagDetail = ({ tagId }: { tagId?: string }) => {
     tagId,
   ]);
 
-  if (!currentTag || !tagId) {
-    return <PageNotFound />;
-  }
-
-  // eslint-disable-next-line react-hooks/rules-of-hooks
   const handleDisplayPreferenceChange = useCallback(
     (displayPreference: ExplorerDisplayPreference) => {
       explorerContextValue.displayPreference$.next(displayPreference);
@@ -121,6 +116,10 @@ export const TagDetail = ({ tagId }: { tagId?: string }) => {
     [explorerContextValue]
   );
 
+  if (!currentTag || !tagId) {
+    return <PageNotFound />;
+  }
+
   return (
     <DocExplorerContext.Provider value={explorerContextValue}>
       <ViewTitle title={tagName ?? 'Untitled'} />