[MacPorts] #41502: vigra: python27 should only be default if python26 isn't selected

[MacPorts]

#41502: vigra: python27 should only be default if python26 isn't selected
--------------------------+-------------------------------
 Reporter:  ryandesign@…  |      Owner:  benjamin.seppke@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.2.1
 Keywords:  haspatch      |       Port:  vigra
--------------------------+-------------------------------
 Otherwise this happens:

 {{{
 $ sudo port install vigra +python26
 Error: vigra: Variant python26 conflicts with python27
 Error: Unable to open port: Error evaluating variants
 }}}

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Ticket URL: <https://trac.macports.org/ticket/41502>
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