[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:  seanegan
      Type:  patch   |      Status:  new     
  Priority:  minor   |   Milestone:          
 Component:  QQ      |     Version:  2.4.1   
Resolution:          |    Keywords:  Qun NULL
   Pending:  0       |  
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Changes (by QuLogic):

  * type:  defect => patch

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Ticket URL: <http://developer.pidgin.im/ticket/6199#comment:1>
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