Ability to filter threads with empty/no ids

[yaddy-ranton]

I use /bant/ frequently and many threads from /pol/ and /int/ get dumped there. Threads created on /bant/ contain ids for unique posters but the imported threads do not have ids for posters and I can filter them in a web browser with a /^$/ filter on the OP id. However this doesn't work on kurobaex. Is it possible to make such a filter work?