[Bugs] #1341 IMME: Sugar craches during undo for the first Keyboard component startup

[Sugar Labs Bugs]

#1341: Sugar craches during undo for the first Keyboard component startup
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    Reporter:  alsroot      |          Owner:  sayamindu  
        Type:  defect       |         Status:  reopened   
    Priority:  Immediate    |      Milestone:  0.86       
   Component:  sugar        |        Version:  0.85.x     
    Severity:  Unspecified  |     Resolution:             
    Keywords:  r?           |   Distribution:  Unspecified
Status_field:  Unconfirmed  |  
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Changes (by sayamindu):

  * status:  closed => reopened
  * resolution:  fixed =>


Comment:

 Our patching have exposed a few more bugs.

 1. During startup, the model may get set to '', which causes havoc with
 the other XKB settings as well

 2. In certain situations, model may get set as None or '' and so on, and
 we need to take care of those values.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1341#comment:9>
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