Return an error when a message can not be delivered to a room
For example, in this case:
Apr 15 18:35:13 ciboule biboumi[18996]: src/bridge/bridge.cpp:156: Cannot send message: no client exist for server irc.quakenet.org
Do not just ignore the message, send an error back.
(from redmine: created on 2015-04-15, closed on 2015-05-11)
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