We've observed a crash on Windows when the strings are empty, skipping the conversion seems reasonable in that case.
Bug: None
Change-Id: I3acf3060a88741fb750d7a0cc02e9422713c59cd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/147380
Commit-Queue: Noah Richards <noahric@chromium.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28709}