message: fix issue with injected styles exploding the theme engine
diff: @@ -176,7 +176,7 @@ export async function setTheme(theme) {
  for (let i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
  const href = a.getAttribute("href");
  // shouldn't we be using the 'title' tag rather than the href?
  - const match = href.match(/^bundles\/.*\/theme-(.*)\.css$/);
  + const match = href && href.match(/^bundles\/.*\/theme-(.*)\.css$/);
  if (match) {
  styleElements[match[1]] = a;
  }
  