[Bugs] #3709 Jukebox UNSP: Jukebox should safely ignore when referenced media is not found

[Sugar Labs Bugs]

#3709: Jukebox should safely ignore when referenced media is not found
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    Reporter:  manuq                      |          Owner:  godiard    
        Type:  defect                     |         Status:  assigned   
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  Jukebox                    |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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Comment(by godiard):

 The attached patch show a alert, if the media to be played is not found.
 The control is done in the different interactions the user can do (in the
 playlist, or with the buttons in the toolbar)

 The playlist is preserved.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3709#comment:5>
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