[Bugs] #527 UNSP: Do not publish activities with empty application list

[SugarLabs Bugs]

#527: Do not publish activities with empty application list
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    Reporter:  alsroot                    |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  activities.sugarlabs.org   |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfimed                 
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 at present, its possible to create/nominate/publish activities with empty
 application list which means, at least, that activities are not listed in
 search list

 think, aslo should prevent, at least, nominating these activities

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Ticket URL: <http://dev.sugarlabs.org/ticket/527>
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