[Bugs] #2585 UNSP: save fails with None buddy reference

[Sugar Labs Bugs]

#2585: save fails with None buddy reference
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    Reporter:  walter                     |          Owner:                             
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  0.90.x                     
    Severity:  Unspecified                |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  Unspecified                
   Seeta_dev:                             |  
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 I joined a seeming phantom shared activity and got this error when
 quitting:

 1297121383.895540 ERROR root: Error saving activity object to datastore
 Traceback (most recent call last):
   File "/usr/lib/python2.7/site-packages/sugar/activity/activity.py", line
 823, in _prepare_close
     self.save()
   File "/usr/lib/python2.7/site-packages/sugar/activity/activity.py", line
 642, in save
     buddies_dict = self._get_buddies()
   File "/usr/lib/python2.7/site-packages/sugar/activity/activity.py", line
 617, in _get_buddies
     buddy_id = sha1(buddy.props.key).hexdigest()
 TypeError: must be string or buffer, not None

 We should catch the None buddy instance.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2585>
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