[Updated] D10528: git: initialize `extra` to have at least the branch name for nullid

[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/D10528/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D10528

To: mharbison72, durin42, #hg-reviewers, pulkit
Cc: mercurial-patches
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