[Bugs] #980 UNSP: traceback on orphaned palette

[SugarLabs Bugs]

#980: traceback on orphaned palette
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    Reporter:  sascha_silbe               |          Owner:  erikos           
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar-toolkit              |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  Unconfirmed      
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 The following traceback was in my shell.log:

 {{{
 Traceback (most recent call last):
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.5/site-
 packages/sugar/graphics/palette.py", line 649, in __show_cb
     self._invoker.notify_popup()
 AttributeError: 'NoneType' object has no attribute 'notify_popup'
 }}}

 Probably related to a palette in the Journal that didn't disappear on
 opening the details view (same as bug #919?).

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Ticket URL: <http://dev.sugarlabs.org/ticket/980>
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