BUGFIX: invalid or missing threadIDs now caught
BUGFIX: invalid or missing threadIDs now caught

mandrew/silverstripe-forum,camfindlay/silverstripe-forum,gordonbanderson/silverstripe-forum,gordonbanderson/silverstripe-forum,mandrew/silverstripe-forum,Olliepop/silverstripe-forum,Olliepop/silverstripe-forum,camfindlay/silverstripe-forum