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Also fix an issue in the presubmit script when supported_on is empty.

Change-Id: Ic72f06e05e11052fecba8dd013f28ba77a37848c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368174
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Yann Dago <ydago@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800684}