[MacPorts] #13313: variants and platforms should never return an error

[MacPorts]

#13313: variants and platforms should never return an error
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  Reporter:  edewitt at mac.com  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  defect           |      Status:  new                                  
  Priority:  High             |   Milestone:  Port Bugs                            
 Component:  ports            |     Version:                                       
Resolution:                   |    Keywords:  parsing variant                      
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Changes (by nox at macports.org):

  * priority:  Normal => High

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/13313#comment:5>
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