[MacPorts] #59538: github portgroup doesn't work with default master_sites from other portgroups

[MacPorts]

#59538: github portgroup doesn't work with default master_sites from other
portgroups
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  Reporter:  jmroot  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by ryandesign):

 The github portgroup sets a default for master_sites when it is included.
 Why would setting that default again (or instead) when github.setup is
 called be helpful?

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Ticket URL: <https://trac.macports.org/ticket/59538#comment:5>
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