[Bugs] #522 NORM: addons shouldn't allow posting an activity if another already exists with the same bundle_id

[SugarLabs Bugs]

#522: addons shouldn't allow posting an activity if another already exists with
the same bundle_id
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    Reporter:  tomeu                     |          Owner:  tomeu                      
        Type:  defect                    |         Status:  new                        
    Priority:  Normal                    |      Milestone:  Unspecified by Release Team
   Component:  activities.sugarlabs.org  |        Version:  Unspecified                
    Severity:  Minor                     |       Keywords:                             
Distribution:  Unspecified               |   Status_field:  New                        
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Ticket URL: <http://dev.sugarlabs.org/ticket/522>
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