This is to fix bug #6683, When loading a game which was saved during a 'lead up' to a cutscene, _currentRoom is set to 0 (this also occurs in MM/Zak).

This started as of commit '973cb9a281e7b2dc73b7c640172954cc5f0bacfd' (27/04/2005), the new 'loadRoomSubBlocks' function was started to be used, which has a check was added to ensure a room resource was returned.