[Pidgin] #13001: Pidgin crashes when starting a video chat without a video device

[Pidgin]

#13001: Pidgin crashes when starting a video chat without a video device
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 Reporter:  kastel           |     Owner:  Maiku
     Type:  defect           |    Status:  new  
Component:  Voice and Video  |   Version:  2.7.5
 Keywords:                   |  
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 After clicking on the "audio/video chat" button, instead of displaying the
 error, Pidgin crashed. I was using XMPP.

 A backtrace and debug log is attached

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Ticket URL: <http://developer.pidgin.im/ticket/13001>
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