Fixed an issue in the LINE booking assistant where tapping an older list button could result in no reply at all.
- This happened when the requested page of classes or other items no longer existed, for example after an item was archived, hidden, or moved.
- Previously the whole reply was dropped, so the customer saw nothing and had no way to continue.
- The bot now replies with a short No more items message (shown in the customer's bot language) and still offers the menu so they can carry on browsing or booking.
