[Touchless] Guard against parsing null/empty strings.

Bug: 955174
Change-Id: Id6a01cb3f237a088add8062717d8354b77cefa52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1577932
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653579}
1 file changed