Don't add file if plugin sets content to `None`
tree6d7834ca1c6fc69ff020f22579d171534015c3f5
-rw-r--r-- 85 .gitattributes
drwxr-xr-x - .github
-rw-r--r-- 28 .gitignore
-rw-r--r-- 91 .gitmodules
-rw-r--r-- 2465 README-SUBMODULES.md
-rw-r--r-- 12783 README.md
-rwxr-xr-x 24445 hg-fast-export.py
-rwxr-xr-x 7198 hg-fast-export.sh
-rwxr-xr-x 5079 hg-reset.py
-rwxr-xr-x 2451 hg-reset.sh
-rwxr-xr-x 3930 hg2git.py
drwxr-xr-x - pluginloader
drwxr-xr-x - plugins
-rwxr-xr-x 1048 run-tests
drwxr-xr-x - t
drwxr-xr-x - tests