[MacPorts] #19224: BUG: variant_isset does not work on required variants

[MacPorts]

#19224: BUG: variant_isset does not work on required variants
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 Reporter:  raimue@…             |       Owner:  macports-tickets@…                   
     Type:  defect               |      Status:  new                                  
 Priority:  Normal               |   Milestone:  MacPorts Future                      
Component:  base                 |     Version:  1.7.1                                
 Keywords:  variants requires    |        Port:                                       
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Comment(by perry@…):

 I've attached a patch that seems to fix the bug. Any thoughts? I'm not
 sure if I added the logic to the correct place.

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Ticket URL: <http://trac.macports.org/ticket/19224#comment:1>
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