[Bugs] #2447 UNSP: Turtleart fail gracefully on bad file

[Sugar Labs Bugs]

#2447: Turtleart fail gracefully on bad file
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    Reporter:  tonyforster                |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Turtleart                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  Unspecified                
   Seeta_dev:                             |  
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Comment(by walter):

 http://git.sugarlabs.org/projects/turtleart/repos/mainline/commits/e074e2e28f6193730757830561ddd551c4b52a19

 and

 http://git.sugarlabs.org/projects/turtleart/repos/mainline/commits/ddd48d34a05fb540f40fd81c61a25f99f0d7f741

 should catch many more of the Value and Key errors that may be associated
 with bad block descriptions in TA files.

 Needs testing.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2447#comment:1>
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