[Pidgin] #1204: Don't show "Block" for blocked users

[Pidgin]

#1204: Don't show "Block" for blocked users
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 Reporter:  lobais        |       Type:  defect
   Status:  new           |   Priority:  minor 
Component:  pidgin (gtk)  |    Version:  2.0   
 Keywords:                |    Pending:  0     
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 "Block" items in right click menu in buddy list and in left most menu in
 conversation windows should be changed to "Unblock" when a user is already
 blocked.

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Ticket URL: <http://developer.pidgin.im/ticket/1204>
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