[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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 With a bad ta file, skip the bad block and load the rest of the ta file or
 skip the ta file but still start?

   File "/home/olpc/Activities/TurtleArt.activity/TurtleArt/tablock.py",
 line 366, in _set_label_attributes
     n = len(BLOCK_NAMES[self.name])
 KeyError: u'cleanr'

 TA100 373pyg XO1

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