[Bugs] #2539 UNSP: No feedback when loaded with no external media

[Sugar Labs Bugs]

#2539: No feedback when loaded with no external media
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    Reporter:  sridhar                    |          Owner:  silbe                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Backup                     |        Version:  0.84.x                     
    Severity:  Unspecified                |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  OLPC                       
   Seeta_dev:                             |  
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 '''Steps to reproduce:'''

   1. ensure that no external media are connected
   2. start Backup

 '''What happens:'''

   * most of the screen is plain grey
   * only the stop button is usable
   * the media drop-down and the backup button are greyed out

 '''What should happen:''' the user should get a message reminding them to
 plug in an external media device before starting Backup.

 The problem at the moment is that it is unclear that Backup requires
 external media to be connected in order to back up.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2539>
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