[MacPorts] #19428: upgrade all fails because of missing port

[MacPorts]

#19428: upgrade all fails because of missing port
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 Reporter:  Dave@…         |       Owner:  macports-tickets@…                   
     Type:  defect         |      Status:  new                                  
 Priority:  Normal         |   Milestone:  Port Bugs                            
Component:  ports          |     Version:  1.7.1                                
 Keywords:                 |        Port:                                       
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 Z% sudo port upgrade all
 Password:
 Error: a2ps is not installed
 Z%

 I don't see why this should happen. If there's an option that will keep it
 from happening, the error message should tell me how to re-run the command
 so the error won't occur.

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Ticket URL: <http://trac.macports.org/ticket/19428>
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