[irclog] fixed caching for channel index
[irclog] fixed caching for channel index


git-svn-id: c5d0433c0270e68665803a75fa5083c304bab3b9@18617 c213334d-75ef-0310-aa23-eaa082d1ae64

yongbin/ilbot,yongbin/ilbot,yongbin/ilbot