Testing Done:
Used irssi to send `CTCP VERSION` to a channel and the pidgin3 user directly and verified the response was sent and that the default message was still displayed.
Bugs closed: PIDGIN-17721
Reviewed at https://reviews.imfreedom.org/r/2863/
PidginandFinch:ThePimpin' Penguin IM Clients That'reGoodfortheSoul