[Bugs] #701 UNSP: Let user upgrade system activity from .xo

[SugarLabs Bugs]

#701: Let user upgrade system activity from .xo
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    Reporter:  alsroot                    |          Owner:  tomeu      
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.84       
   Component:  sugar                      |        Version:  0.84.x     
    Severity:  Unspecified                |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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 at present sugar raise exception but install .xo
 thus there are two activities in activities list

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Ticket URL: <http://dev.sugarlabs.org/ticket/701>
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