[Bugs] #1714 UNSP: Do not fail while closing object less activities

[Sugar Labs Bugs]

#1714: Do not fail while closing object less activities
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    Reporter:  alsroot                    |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit              |        Version:  Git as of bugdate          
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 * start any activity(dunno about real examples) i.e. Activity.__init__'s
 argument create_jobject is False
 * click close button
 * activity won't stop and will log error

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1714>
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