[Bugs] #3460 UNSP: traceback in Browse for 'set_invoker'

[Sugar Labs Bugs]

#3460: traceback in Browse for 'set_invoker'
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    Reporter:  erikos                     |          Owner:  erikos           
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.96             
   Component:  sugar-toolkit-gtk3         |        Version:  Git as of bugdate
    Severity:  Minor                      |       Keywords:  12.1.0           
Distribution:  OLPC                       |   Status_field:  New              
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 palettewindow.py line 499 'NoneType' object has no attribute 'set_invoker'

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3460>
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