See https://discourse.phabricator-community.org/t/arc-not-supporting-git-2-17-1/.
When treating it a large file binary, we try to get the "old" and "new" content using git ls-tree and cat-file.
If the file is new or deleted, there is no old file, so we try to work with filename null.
Under git < 2.17.1, that gets treated as git ls-tree -- ., which falls in the next condition under "no such path".
In git 2.18, etc, this is an error.
Explicitly bail out if there is no filename.