[MacPorts] #50922: htcondor: make python27 the default only if no other python variant already selected

[MacPorts]

#50922: htcondor: make python27 the default only if no other python variant already
selected
--------------------------+-----------------------
 Reporter:  ryandesign@…  |      Owner:  aronnax@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.4
 Keywords:                |       Port:  htcondor
--------------------------+-----------------------
 The python27 variant should be made the default only if the user has not
 already selected another python variant, to prevent this problem:

 {{{
 $ sudo port install htcondor +python34
 Error: htcondor: Variant python27 conflicts with python34
 Error: Unable to open port: Error evaluating variants
 }}}

 See PortfileRecipes#default_variants

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Ticket URL: <https://trac.macports.org/ticket/50922>
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