message: Only add x-csrf-token query param if set
diff: import { getCSRFToken } from '../co-fetch';
  function addCSRFQueryParam(href) {
  - const url = new URL(href);
  const csrfToken = getCSRFToken();
  + if (!csrfToken) {
  + return href;
  + }
  +
  + const url = new URL(href);
  url.searchParams.set('x-csrf-token', csrfToken);
  return url.href;
  }
  