[Bugs] #4454 sugar-toolkit-gtk3 UNSP: Error at exit activity after participate in collaboration

[Sugar Labs Bugs]

#4454: Error at exit activity after participate in collaboration
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    Reporter:  godiard                    |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit-gtk3         |        Version:  0.98.x                     
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 TestCase

 * Share one activity, join from other xo.

 * Close the activity in both xos.

 * Restart the shared instance.

 * Close the activity.

 In the log appear the following error:

 {{{
 1362056835.459781 WARNING root: No Gtk.AccelGroup in the top level window.
 1362056835.461814 WARNING root: No Gtk.AccelGroup in the top level window.
 1362056835.476242 WARNING root: No Gtk.AccelGroup in the top level window.
 Traceback (most recent call last):
   File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 604, in
 msg_reply_handler
     reply_handler(*message.get_args_list(**get_args_opts))
   File "/usr/lib/python2.7/site-packages/sugar3/activity/activity.py",
 line 614, in __save_cb
     self._complete_close()
   File "/usr/lib/python2.7/site-packages/sugar3/activity/activity.py",
 line 920, in _complete_close
     self.shared_activity.leave()
   File "/usr/lib/python2.7/site-packages/sugar3/presence/activity.py",
 line 471, in leave
     self.telepathy_text_chan.Close()
 AttributeError: 'NoneType' object has no attribute 'Close'
 }}}

 Does not happen every time, but is easy to reproduce.

 Tested in os32, 13.1.0

-- 
Ticket URL: <http://bugs.sugarlabs.org/ticket/4454>
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