[Pidgin] #6199: fix QQ Qun (NULL) error in 2.4.1

[Pidgin]

#6199: fix QQ Qun (NULL) error in 2.4.1
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 Reporter:  colyli                       |        Owner:  csyfek
     Type:  patch                        |       Status:  new   
Milestone:  Patches Needing Improvement  |    Component:  QQ    
  Version:  2.4.1                        |   Resolution:        
 Keywords:  Qun NULL                     |  
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Comment(by ccpaging):

 Any detail information in your can?

 OS version, pidgin about, pidgin debug information.

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Ticket URL: <http://developer.pidgin.im/ticket/6199#comment:11>
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