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If stdout or stderr are empty, don't print empty lines. Also trim any trailing lines so we don't show excess ones. Change-Id: I65fcea191e1f725be03c064cb510578632466013 Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/343516 Tested-by: Mike Frysinger <vapier@google.com> Reviewed-by: LaMont Jones <lamontjones@google.com>