Revert "Revert "Handle potentially null strings passed as ProtoL..."

Revert submission 28207894-revert-28147757-no-processing-protolog-IJZXUZOQGO

Reason for revert: Re-landing change

Reverted changes: /q/submissionid:28207894-revert-28147757-no-processing-protolog-IJZXUZOQGO

Change-Id: I0805cb9be59ba01d504ac292a831e4fa8d903c34
2 files changed