D117: run-tests: warn if --color=always and no pygments installed

[krbullock (Kevin Bullock)]

krbullock accepted this revision.
krbullock added a comment.
This revision is now accepted and ready to land.


  Queued, thanks.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D117

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To: martinvonz, #hg-reviewers, krbullock
Cc: krbullock, yuja, mercurial-devel