"git diff --ignore-space-change --stat" lists files with only whitespace differences as "changed"

A bug report: I noticed that "git diff --ignore-space-change --stat" lists files with only whitespace differences as having changed with 0 differing lines. This is inconsistent with the behavior without -- stat, which doesn't list such files at all. (Same behavior with all the --ignore*space* flags.) I can reproduce this with the current "next", af746e4. Quick test case:

echo ' ' >test1 && echo '  ' >test2 && git diff --stat --no-index --ignore-space-change test1 test2

This caused me some inconvenience in the following scenario: I was reading a commit diff that had a bulk license change in all files combined with code changes. I attempted to revert the bulk license change locally using "sed" to more easily read the code diff, but my reversion left some whitespace diffs where the original files had inconsistent whitespace. So the diffstat after my reversion was cluttered with these "0" entries.

Regards, Matt