fix: ignore fixer tool configurations that are missing patterns This is to prevent a crash under the same circumstances. This is also to avoid data loss due to accidental application of a fixer tool to all files, if the matching logic somehow changed to that effect. Affecting all files until otherwise configured would be dangerous, and not very useful. We shouldn't abort because there may be other fixers, and it may still be useful to run them without having to adjust configuration. A user might not feel confident in changing configs, for example. Differential Revision: https://phab.mercurial-scm.org/D6693

Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install::

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing::

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.