fix bug: removing last comment of a conversation
fix bug: removing last comment of a conversation

The two events where overlapping and once the comment
was removed, the other event was never executed.

teambox/teambox,vveliev/teambox,ccarruitero/teambox,crewmate/crewmate,nfredrik/teambox,teambox/teambox,vveliev/teambox,codeforeurope/samenspel,rahouldatta/teambox,wesbillman/projects,rahouldatta/teambox,irfanah/teambox,rahouldatta/teambox,vveliev/teambox,teambox/teambox,crewmate/crewmate,alx/teambox,nfredrik/teambox,nfredrik/teambox,irfanah/teambox,irfanah/teambox,vveliev/teambox,nfredrik/teambox,ccarruitero/teambox,alx/teambox,irfanah/teambox,crewmate/crewmate,codeforeurope/samenspel,wesbillman/projects