Avoid sending `ide-open-view-null-once` event (#21247)

GitOrigin-RevId: 2f46fe26561bfa2eca36ad605cdd217514aba09d

services/web/frontend/js/features/ide-react/hooks/use-layout-event-tracking.ts

@@ -6,7 +6,7 @@ export function useLayoutEventTracking() {
   const { view, leftMenuShown, chatIsOpen } = useLayoutContext()
 
   useEffect(() => {
-    if (view !== 'editor' && view !== 'pdf') {
+    if (view && view !== 'editor' && view !== 'pdf') {
       sendMBOnce(`ide-open-view-${view}-once`)
     }
   }, [view])