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This CL fixes an issue where validate_format.py would catch OWNERS files
that were 'empty' because they only had OWNERS that were already in
the list of <owner> emails.

Bug: 1055668
Change-Id: Ie832a566d3c99cfaaa0ad621def8f990190b5bda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076639
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745314}