[MacPorts] #45572: new fallback livecheck fails for ports that don't set master_sites

[MacPorts]

#45572: new fallback livecheck fails for ports that don't set master_sites
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  Reporter:  ryandesign@…  |      Owner:  khindenburg@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.99
Resolution:                |   Keywords:
      Port:                |
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Comment (by larryv@…):

 Ports that store distfiles in their `filespath` instead of downloading
 them don’t need a `master_sites`.

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Ticket URL: <https://trac.macports.org/ticket/45572#comment:2>
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