[Updated] D8956: rhg: print error message when argument parsing fails

[pulkit (Pulkit Goyal)]

This revision is now accepted and ready to land.
pulkit accepted this revision.

REPOSITORY
  rHG Mercurial

BRANCH
  default

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D8956/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D8956

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