[Accepted] D8865: rhg: ask the error message from `CommandError`

[Alphare (Raphaël Gomès)]

Alphare accepted this revision.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D8865/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D8865

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