message: Fix `undefined` bug in Open All Notifications feature
  Fixes
diff: @@ -33,7 +33,7 @@ export default function () {
  groupButtons([...group.children]);
  // Move out the extra node that messes with .BtnGroup-item:last-child
  - document.body.append(select('#mark_as_read_confirm_box'));
  + document.body.append(select('#mark_as_read_confirm_box') || '');
  if (unreadCount < 10) {
  openButton.addEventListener('click', openNotifications);
  