[MacPorts] #60127: pybombs: portindex fails

[MacPorts]

#60127: pybombs: portindex fails
---------------------+-----------------------
 Reporter:  dbevans  |      Owner:  michaelld
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  pybombs
---------------------+-----------------------
 {{{
 Error:

 You must select a Python variant; you cannot select -python38 alone.

 Failed to parse file science/pybombs/Portfile: Invalid variant selection.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60127>
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