fix: crash when alt key pressed with falsy menu bar visiblity (#17766)

atom/browser/ui/views/root_view.cc

@@ -145,9 +145,11 @@ void RootView::HandleKeyEvent(const content::NativeWebKeyboardEvent& event) {
 
     View* focused_view = GetFocusManager()->GetFocusedView();
     last_focused_view_tracker_->SetView(focused_view);
+    if (menu_bar_visible_) {
       menu_bar_->RequestFocus();
       // Show accelerators when menu bar is focused
       menu_bar_->SetAcceleratorVisibility(true);
+    }
   } else {
     // When any other keys except single Alt have been pressed/released:
     menu_bar_alt_pressed_ = false;