[Bugs] #497 NORM: activities are show twice for some files

[SugarLabs Bugs]

#497: activities are show twice for some files
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    Reporter:  tomeu   |          Owner:  tomeu            
        Type:  defect  |         Status:  new              
    Priority:  Normal  |      Milestone:  0.84             
   Component:  sugar   |        Version:  Git as of bugdate
    Severity:  Minor   |       Keywords:                   
Distribution:  Ubuntu  |   Status_field:  Assigned         
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 To reproduce, copy a .m3u file from a usb stick, then hover over to
 display the palette and check the "Start with" submenu. Activities appear
 duplicated.

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Ticket URL: <http://dev.sugarlabs.org/ticket/497>
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