[Bugs] #619 UNSP: Method "AddMembers" with signature "aus" on interface "org.freedesktop.Telepathy.Channel.Interface.Group" doesn't exist

[SugarLabs Bugs]

#619: Method "AddMembers" with signature "aus" on interface
"org.freedesktop.Telepathy.Channel.Interface.Group" doesn't exist
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    Reporter:  sascha_silbe               |          Owner:  morgs            
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar-presence-service     |        Version:  Git as of bugdate
    Severity:  Minor                      |     Resolution:                   
    Keywords:                             |   Distribution:  Unspecified      
Status_field:  Unconfirmed                |  
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Comment(by gdesmott):

 I guess either Gabble crashed or the subscribe channel has been closed
 (because of disconnection probably).

 A possible fix could be to set self._{subscribe,publish}_channel to None
 when connection is disconnected or when these channels are closed.
 Then _add_not_subscribed_to_subscribe_channel should make an async call to
 GetAllMembers and the callback should check that self._subscribe_channel
 is still not None before calling AddMembers.

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Ticket URL: <http://dev.sugarlabs.org/ticket/619#comment:1>
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