Couple of tweaks:
- If a conpherence has no participants, we fail to attachParticipants(). This can happen if you leave a Conpherence as the last participant, then visit the URI again explicitly.
- If you can't load any transactions (usually, because you don't have permission to view a thread's transactions), we try to attach null instead of array(). This can happen if you attempt to view a thread you don't have permission to see. A more general fix would be to tweak the load/filtering order, but I'm leaving that for another time since it's more involved and only gives us a small performance gain in unusual sitautions.
- initializeNewThread() should be declared static.