[Pidgin] #13238: vvconfig: Use compare function that will not crash on NULL string

[Pidgin]

#13238: vvconfig: Use compare function that will not crash on NULL string
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 Reporter:  haakon                       |        Owner:         
     Type:  patch                        |       Status:  new    
Milestone:  Patches Needing Improvement  |    Component:  plugins
  Version:  2.7.9                        |   Resolution:         
 Keywords:  vvconfig crash strcmp        |  
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Comment(by darkrain42):

 Why is the linked list being terminated with an element whose ''value'' is
 NULL?

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Ticket URL: <http://developer.pidgin.im/ticket/13238#comment:4>
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