[Pidgin] #14942: Recognize absence of the '#' prefix when joining IRC channel

[Pidgin]

#14942: Recognize absence of the '#' prefix when joining IRC channel
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 Reporter:  FelixAkk                                                               |     Owner:  elb   
     Type:  enhancement                                                            |    Status:  new   
Component:  IRC                                                                    |   Version:  2.10.1
 Keywords:  irc, join, dialog, error, user input, interpretation, no such channel  |  
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 When joining a IRC channel using the "Join chat ..." menu item (under the
 Buddies), one would expect the GUI to be sophisticated enough that when
 one does not prefix the channel name with a hash symbol (#), the GUI will
 still interpret is as a channel name. The field where one enters this is
 labeled with channel so I don't see what other interpretation would be
 possible.

 This confused me for quite a while before I realized that my channel does
 exist (because the error dialog says "No such channel" which is not very
 helpful when the channel does exist), and that the GUI requires that you
 prefix the channel name even though it obviously is a channel name you're
 entering there.

 So in short:
 - fix interpretation
 - don't show 'no such channel' dialog when the channel does exist

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Ticket URL: <http://developer.pidgin.im/ticket/14942>
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