[Bugs] #1548 Jukebox UNSP: unhelpful error message for unsupported codecs

[Sugar Labs Bugs]

#1548: unhelpful error message for unsupported codecs
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    Reporter:  sascha_silbe               |          Owner:  godiard          
        Type:  defect                     |         Status:  assigned         
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98             
   Component:  Jukebox                    |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:  easy-hack        
Distribution:  Unspecified                |   Status_field:  New              
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Comment(by manuq):

 Also (but less important) would be good to style the message box.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1548#comment:7>
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