[Bugs] #177 NORM: palettes are created several times

[SugarLabs Bugs]

#177: palettes are created several times
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 Reporter:  tomeu   |       Owner:  marcopg          
     Type:  defect  |      Status:  new              
 Priority:  normal  |   Milestone:                   
Component:  sugar   |     Version:  Git as of bugdate
 Keywords:          |  
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 Seems like the invoker is calling create_palette() every time it needs a
 palette, but the palette is still referenced by the widget, thus
 accumulating.

 To check, print self.props.palette at the start of create_palette().

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Ticket URL: <http://dev.sugarlabs.org/ticket/177>
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