Backtrace in groupchat_control.py

      File "/usr/share/gajim/src/common/xmpp/idlequeue.py", line 497, in _process_events
        return IdleQueue._process_events(self, fd, flags)
      File "/usr/share/gajim/src/common/xmpp/idlequeue.py", line 367, in _process_events
        obj.pollin()
      File "/usr/share/gajim/src/common/xmpp/transports_nb.py", line 390, in pollin
        self._do_receive()
      File "/usr/share/gajim/src/common/xmpp/transports_nb.py", line 570, in _do_receive
        self._on_receive(received)
      File "/usr/share/gajim/src/common/xmpp/transports_nb.py", line 582, in _on_receive
        self.on_receive(data)
      File "/usr/share/gajim/src/common/xmpp/dispatcher_nb.py", line 445, in dispatch
        handler['func'](session, stanza)
      File "/usr/share/gajim/src/common/connection_handlers.py", line 2235, in _presenceCB
        avatar_sha))
      File "/usr/share/gajim/src/common/connection.py", line 199, in dispatch
        self.put_event((event, data))
      File "/usr/share/gajim/src/common/connection.py", line 195, in put_event
        gajim.handlers[ev[0]](self.name, ev[1])
      File "gajim.py", line 1262, in handle_event_gc_notify
        array[6], array[7], array[8], array[9], array[10], array[11])
      File "/usr/share/gajim/src/groupchat_control.py", line 1282, in chg_contact_status
        actual_affiliation = gc_c.affiliation
    AttributeError: 'NoneType' object has no attribute 'affiliation'