[MacPorts] #69563: aria2 @1.37.0_4+docs: can't read "python.version": no such variable

[MacPorts]

#69563: aria2 @1.37.0_4+docs: can't read "python.version": no such variable
---------------------------+-------------------------
  Reporter:  ShadSterling  |      Owner:  Schamschula
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.1
Resolution:                |   Keywords:
      Port:  aria2         |
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Comment (by ryandesign):

 Also the +docs variant only adds dependencies. It doesn't do anything to
 ensure that docs ''won't'' be built if the +docs variant ''isn't''
 selected but those dependencies happen already to be installed.

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Ticket URL: <https://trac.macports.org/ticket/69563#comment:6>
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