message: hooks: Don't err on new branches.
diff: @@ -20,6 +20,10 @@ def main():
  for line in sys.stdin:
  _, local_sha, _, remote_sha = line.strip().split(' ')
  + if remote_sha == '0000000000000000000000000000000000000000':
  + # FIXME: We should still check, but against what?
  + continue
  +
  # Only check commits we are adding.
  base_sha = git.git(['merge-base', local_sha, remote_sha])
  