[Bugs] #4316 Turtleart UNSP: TA file fails to resume

[Sugar Labs Bugs]

#4316: TA file fails to resume
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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:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by tonyforster):

 tawindow.py line 3493
 object nonetype has no len()

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4316#comment:1>
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