[Bugs] #3168 UNSP: Can not change views for a while

[Sugar Labs Bugs]

#3168: Can not change views for a while
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    Reporter:  erikos                     |          Owner:  erikos
        Type:  defect                     |         Status:  new   
    Priority:  Unspecified by Maintainer  |      Milestone:  0.94  
   Component:  sugar                      |        Version:  0.93.x
    Severity:  Major                      |       Keywords:        
Distribution:  Unspecified                |   Status_field:  New   
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 on os 8 (Sugar 0.94.0) I had a moment where I could not change to another
 view from the neighborhood view. I tried with the keyboard and with the
 buttons in the frame.

 {{{
 Traceback (most recent call last):
   File "/usr/lib/python2.7/site-packages/jarabe/view/keyhandler.py", line
 211, in _key_pressed_cb
     method(event_time)
   File "/usr/lib/python2.7/site-packages/jarabe/view/keyhandler.py", line
 159, in handle_zoom_home
     shell.get_model().set_zoom_level(ShellModel.ZOOM_HOME, event_time)
   File "/usr/lib/python2.7/site-packages/jarabe/model/shell.py", line 405,
 in set_zoom_level
     active_window_type = screen.get_active_window().get_type_hint()
 AttributeError: 'NoneType' object has no attribute 'get_type_hint'
 }}}

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3168>
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