message: fix: Fallback to empty string if req.baseUrl is empty
diff: @@ -124,9 +124,7 @@ function extractExpressTransactionName(
  let path = '';
  if (req.route) {
  - // if the mountpoint is `/`, req.baseUrl is '' (not undefined), so it's safe to include it here
  - // see https://github.com/expressjs/express/blob/508936853a6e311099c9985d4c11a4b1b8f6af07/test/req.baseUrl.js#L7
  - path = `${req.baseUrl}${req.route.path}`;
  + path = `${req.baseUrl || ''}${req.route.path}`;
  } else if (req.originalUrl || req.url) {
  path = stripUrlQueryAndFragment(req.originalUrl || req.url || '');
  }
  