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Currently 'git cl uplaod' fails when all files are skipped (e.g. fixing
LayoutTest). This patch makes it pass.

Bug: none
Change-Id: Ib028d39ed63e0cba21918cb565a5c264ad047da7
Reviewed-on: https://chromium-review.googlesource.com/923782Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537270}