[Abandoned] D8777: rhg: Ask the error message from `CommandError`

[acezar (Antoine Cezar)]

acezar abandoned this revision.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D8777/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D8777

To: acezar, #hg-reviewers
Cc: mercurial-patches
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