message: dont assume a user has joined all the rooms in a community
diff: @@ -180,7 +180,10 @@ class TagOrderStore extends Store {
  const client = MatrixClientPeg.get();
  const changedBadges = {};
  groupIds.forEach(groupId => {
  - const rooms = GroupStore.getGroupRooms(groupId).map(r => client.getRoom(r.roomId));
  + const rooms =
  + GroupStore.getGroupRooms(groupId)
  + .map(r => client.getRoom(r.roomId)) // to Room objects
  + .filter(r => !!r); // filter out rooms we haven't joined from the group
  const badge = rooms && RoomNotifs.aggregateNotificationCount(rooms);
  changedBadges[groupId] = (badge && badge.count !== 0) ? badge : undefined;
  });
  