[Updated] D11806: downgrade: don't assume existence of nodemap files when downgrading

[pulkit (Pulkit Goyal)]

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

REPOSITORY
  rHG Mercurial

BRANCH
  stable

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D11806/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D11806

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