[Bugs] #395 UNSP: Do not process nil tray

[SugarLabs Bugs]

#395: Do not process nil tray
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    Reporter:  alsroot                    |          Owner:  marcopg   
        Type:  defect                     |         Status:  new       
    Priority:  Unspecified by Maintainer  |      Milestone:  0.84      
   Component:  sugar-toolkit              |        Version:  0.83.x    
    Severity:  Unspecified                |       Keywords:  r?        
Distribution:  Unspecified                |   Status_field:  Unconfimed
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Ticket URL: <http://dev.sugarlabs.org/ticket/395>
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