fix: replace noop function (#2744)

(cherry picked from commit af6f431c15)

packages/workspace/src/atom.ts

@@ -48,7 +48,7 @@ rootCurrentWorkspaceIdAtom.onMount = set => {
       Router.events.off('routeChangeStart', callback);
     };
   }
-  return () => {};
+  return;
 };
 
 export const rootCurrentPageIdAtom = atom<string | null>(null);
@@ -69,7 +69,7 @@ rootCurrentPageIdAtom.onMount = set => {
       Router.events.off('routeChangeStart', callback);
     };
   }
-  return () => {};
+  return;
 };
 
 // current editor atom, each app should have only one editor in the same time