message: tools: don't crash on empty tags
diff: @@ -48,6 +48,8 @@ def query_pull_requests(gql_client, releases, release_tag, debug=False):
  previous_wanted_release = wanted_release
  wanted_release = release
  + if not release["tag"]:
  + continue
  if release["tag"]["name"] == release_tag:
  break
  