Version 1.11: When configured to use all available sub-boards, still don't allow choosing

a sub-board that has polls disabled.  This fixes an issue where SlyVote was showing all
available message groups but some could be empty due to having no sub-boards that allow polls.
14 jobs for 247_slyvote_msggroup_undefined in 39 minutes and 49 seconds (queued for 5 minutes and 9 seconds)