rewriteutil: replace "null changeset" by "the null revision" in error message
The evolve extension uses "the null revision" and we seem to use that
term much more frequently in core too.
Differential Revision: https://phab.mercurial-scm.org/D10514
[build-system]
requires = ["setuptools", "wheel"]
build-backend = "setuptools.build_meta"
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true