[MacPorts] #13284: `port variants` should fail when no port is found

[MacPorts]

#13284: `port variants` should fail when no port is found
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  Reporter:  guido.soranzio at gmail.com  |       Owner:  macports-dev at lists.macosforge.org
      Type:  defect                    |      Status:  new                              
  Priority:  Normal                    |   Milestone:  MacPorts base bugs               
 Component:  base                      |     Version:  1.5.2                            
Resolution:                            |    Keywords:                                   
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Changes (by ram at macports.org):

 * cc: ram at macports.org (added)

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/13284#comment:2>
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