[Bugs] #4273 sugar UNSP: View Source: provide feedback for non text files

[Sugar Labs Bugs]

#4273: View Source: provide feedback for non text files
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    Reporter:  manuq                      |          Owner:  manuq      
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  1.0        
   Component:  sugar                      |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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 Currently if the user clicks/taps in a row that is not a text file in the
 sidebar, the view is empty, just displays a "1".  Can be seen tapping the
 row of any directory, or png files inside data directory in Browse source.

 This could be improved providing a message, like we do for the non
 matching search in the Journal.  Design action is needed: what message
 should be displayed?

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4273>
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