[Bugs] #4873 Sugar UNSP: busy cursor jams on after startup

[Sugar Labs Bugs]

#4873: busy cursor jams on after startup
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       Reporter:  quozl                      |       Owner:
           Type:  defect                     |      Status:  new
       Priority:  Unspecified by Maintainer  |   Milestone:  Unspecified
      Component:  Sugar                      |     Version:  Unspecified
       Severity:  Unspecified                |    Keywords:
Distribution/OS:  Unspecified                |  Bug Status:  Unconfirmed
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 On particularly slow hardware, the busy cursor may remain active after
 startup.

 shell.log contains:

 {{{
 Traceback (most recent call last):
   File "/usr/lib/python2.7/site-packages/jarabe/desktop/favoritesview.py",
 line 646, in __active_activity_changed_cb
     self._update()
   File "/usr/lib/python2.7/site-packages/jarabe/desktop/favoritesview.py",
 line 625, in _update
     self.get_window().set_cursor(None)
 AttributeError: 'NoneType' object has no attribute 'set_cursor'
 }}}

 Is probably related to
 [https://github.com/sugarlabs/sugar/commit/6c8141ba9994d8ec1f5e29d5ec7e3934091636ee
 Use busy cursor during launch].
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Ticket URL: <http://bugs.sugarlabs.org/ticket/4873>
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