message: fix(page): don't fetch on null or unchanged path
diff: @@ -21,7 +21,8 @@ export class DocsPage {
  }
  @Watch('path')
  - fetchPage(path) {
  + fetchPage(path, oldPath?) {
  + if (path == null || path === oldPath) return;
  return fetch(path)
  .then(this.validateFetch)
  .then(this.handleNewPage)
  