[MacPorts] #12596: malformed variants can break registry

[MacPorts]

#12596: malformed variants can break registry
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 Reporter:  david.reitter@…          |       Owner:  mww@…           
     Type:  defect                   |      Status:  assigned        
 Priority:  Normal                   |   Milestone:  MacPorts Future 
Component:  base                     |     Version:  1.5.0           
 Keywords:                           |        Port:                  
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Comment(by jmr@…):

 Applied a modified version of the error reporting patch in r44612. We
 still need to error out on malformed variants when parsing Portfiles.

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Ticket URL: <http://trac.macports.org/ticket/12596#comment:14>
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