[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 garycmartin):

 What happens if there are multiple tracks missing (I'm assuming a kid
 might keep a music/video collection on a USB memory stick and have many)?
 I assume it is also possible that this message will be generated if the
 user erases tracks from their Journal and then tries to resume a Jukebox
 playlist referencing it? Multiple missing tracks could be from multiple
 devices and/or the Journal.

 Personally I would avoid using the word Error. Manuq, I think, was close
 in his original ticket description. For the case when more than one track
 is missing perhaps something like:

  ''N'' tracks not found.

 Another (more complicated) option could be to list the first few missing
 track names to provide more information:

  Tracks ''words1.ogg'', ''words2.ogg'', ''words3.ogg'' and ''N'' others
 not found.

 If only one track is missing we can be more informative:

  Track ''words2.ogg'' from ''HUMITOS'' not found.

 Or if the missing item was from the Journal:

  Track ''words3.ogg'' from ''Journal'' not found.

 I guess it might have been easier to just disable/grey out missing tracks
 in the playlist ;)

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3709#comment:9>
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