[Pidgin] #4814: Crash if xmpp pong timeout fires after account is disconnected

[Pidgin]

#4814: Crash if xmpp pong timeout fires after account is disconnected
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  Reporter:  nosnilmot  |       Owner:  seanegan              
      Type:  defect     |      Status:  assigned              
  Priority:  blocker    |   Milestone:  2.4.0                 
 Component:  XMPP       |     Version:                        
Resolution:             |    Keywords:  jabber xmpp ping crash
   Pending:  0          |  
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Comment (by nosnilmot at pidgin.im):

 (In [809c8120ab77e68276baba04b130d65aa1cae31a]) I'm going to pretend this
 solves all my problems, except I can't see how
 these would ever be called with a NULL account and my logs show no sign
 that they are either. However, I haven't crashed since I made this change.
 References #4814

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Ticket URL: <http://developer.pidgin.im/ticket/4814#comment:4>
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