[Pidgin] #5215: XMPP: use feature discovery before using features

[Pidgin]

#5215: XMPP: use feature discovery before using features
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  Reporter:  urkle   |       Owner:  deryni
      Type:  defect  |      Status:  new   
  Priority:  minor   |   Milestone:        
 Component:  XMPP    |     Version:  2.4.0 
Resolution:          |    Keywords:        
   Pending:  0       |  
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Changes (by deryni):

  * owner:  nwalp => deryni

Comment:

 I agree that we should be checking things before we use them, I also agree
 that ping was designed such that it doesn't matter (so I'm not concerned
 about that case). Patches welcome, if not I'll get around to looking at it
 eventually.

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Ticket URL: <http://developer.pidgin.im/ticket/5215#comment:3>
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