[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:  patch, screenshot
Distribution:  Unspecified                |   Status_field:  Unconfirmed      
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Comment(by manuq):

 Discussing with Gonzalo we came to this.  Gary, what do you think?:

  1. a message is shown at the start "N tracks not found" with a "Details"
 button
  2. the Details button displays a list of paths that were not found
  3. the rows of the tracks that were not found are grayed out

 As the list of paths can't fit in the Sugar Alert, they can be displayed
 in the canvas.  Jukebox is also displaying another message there
 attachment:Screenshot%20of%20_Jukebox%20Activity_.png:ticket:1548

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3709#comment:14>
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