git: initialize `extra` to have at least the branch name for nullid
Otherwise, this crashes trying to convert to local encoding:
...
File "/mnt/c/Users/Matt/hg/mercurial/logcmdutil.py", line 333, in _show
branch = ctx.branch()
File "/mnt/c/Users/Matt/hg/mercurial/context.py", line 675, in branch
return encoding.tolocal(self._changeset.extra.get(b"branch"))
File "/mnt/c/Users/Matt/hg/mercurial/encoding.py", line 181, in tolocal
if isasciistr(s):
TypeError: a bytes-like object is required, not 'NoneType'
This was originally reported to the thg bug tracker.
https://foss.heptapod.net/mercurial/tortoisehg/thg/-/issues/5629
Differential Revision: https://phab.mercurial-scm.org/D10528
syntax: glob
*.elc
*.tmp
*.orig
*.rej
*~
*.mergebackup
*.o
*.so
*.dll
*.exe
*.pyd
*.pyc
*.pyo
*$py.class
*.swp
*.prof
*.zip
\#*\#
.\#*
tests/artifacts/cache/big-file-churn.hg
tests/.coverage*
tests/.testtimes*
tests/.hypothesis
tests/hypothesis-generated
tests/annotated
tests/exceptions
tests/python3
tests/*.err
tests/htmlcov
build
contrib/chg/chg
contrib/hgsh/hgsh
contrib/vagrant/.vagrant
dist
packages
doc/common.txt
doc/*.[0-9]
doc/*.[0-9].txt
doc/*.[0-9].gendoc.txt
doc/*.[0-9].{x,ht}ml
MANIFEST
MANIFEST.in
patches
mercurial/__modulepolicy__.py
mercurial/__version__.py
mercurial/hgpythonlib.h
mercurial.egg-info
.DS_Store
tags
cscope.*
.vscode/*
.idea/*
.asv/*
.pytype/*
.mypy_cache
i18n/hg.pot
locale/*/LC_MESSAGES/hg.mo
hgext/__index__.py
rust/target/
rust/*/target/
# Generated wheels
wheelhouse/
syntax: rootglob
# See Profiling in rust/README.rst
.cargo/config
syntax: regexp
^\.pc/
^\.(pydev)?project
# hackable windows distribution additions
^hg-python
^hg.py$