[MacPorts] #18479: port lint shouldn't warn that master_sites is required when there are no distfiles

[MacPorts]

#18479: port lint shouldn't warn that master_sites is required when there are no
distfiles
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 Reporter:  ryandesign@…             |       Owner:  ryandesign@…           
     Type:  enhancement              |      Status:  new                    
 Priority:  Normal                   |   Milestone:  MacPorts 1.8.0         
Component:  base                     |     Version:  1.7.0                  
 Keywords:                           |        Port:                         
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 `port lint` complains that the `master_sites` variable is required, even
 in cases where it isn't, such as when there are no distfiles.

 This is another case like the one that was handled in #14377.

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Ticket URL: <http://trac.macports.org/ticket/18479>
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