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

[Sugar Labs Bugs]

#2585: save fails with None buddy reference
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  Reporter:  walter                     |            Owner:  erikos
      Type:  defect                     |           Status:  reopened
  Priority:  Unspecified by Maintainer  |        Milestone:  Unspecified
 Component:  Sugar                      |          Version:  0.98.x
  Severity:  Unspecified                |       Resolution:
  Keywords:                             |  Distribution/OS:  Unspecified
Bug Status:  Unconfirmed                |
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Changes (by godiard):

 * version:  0.90.x => 0.98.x

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Comment:

 I can reproduce it on 13.2.0 / os11.

 Step to reproduce.

 * Open one activity and share it on XO A.
 * Join in XO B.
 * Close activity on XO B.
 * Try to close activity on XO A.

 The error happen only on XO A. Strange XO B can save ok, and show the icon
 of the other xo in the journal.

 Log error:

 {{{
 1375709688.074790 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
 867, in _prepare_close
     self.save()
   File "/usr/lib/python2.7/site-packages/sugar/activity/activity.py", line
 686, in save
     buddies_dict = self._get_buddies()
   File "/usr/lib/python2.7/site-packages/sugar/activity/activity.py", line
 661, in _get_buddies
     buddy_id = sha1(buddy.props.key).hexdigest()
 TypeError: sha1() argument 1 must be string or buffer, not None

 }}}
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Ticket URL: <http://bugs.sugarlabs.org/ticket/2585#comment:9>
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