[Bugs] #1192 UNSP: Object chooser remains shown after activity has been closed

[SugarLabs Bugs]

#1192: Object chooser remains shown after activity has been closed
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    Reporter:  sascha_silbe               |          Owner:  tomeu            
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  New              
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 Steps to reproduce:
 1. Open Browse
 2. Navigate to some page that has a file upload form.
 3. Click "Browse" to open Journal object picker.
 4. Close the activity without closing the object picker first.

 What I expected: Close the object picker as well.

 What happened: The object picker is shown on top of the home view.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1192>
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