message: fix: only run onLoading if external stylesheets exist
diff: @@ -34,7 +34,9 @@ export const onCssReady = ({
  let count = cssPages.length;
  - onLoad(dom);
  + if (count > 0) {
  + onLoading(dom);
  + }
  cssPages.forEach(cssPage =>
  cssPage.addEventListener('load', () => {
  