message: fix: ignore empty x-tagGroups array
diff: @@ -43,7 +43,7 @@ export class MenuBuilder {
  const items: ContentItemModel[] = [];
  const tagsMap = MenuBuilder.getTagsWithOperations(spec);
  items.push(...MenuBuilder.addMarkdownItems(spec.info.description || '', options));
  - if (spec['x-tagGroups']) {
  + if (spec['x-tagGroups'] && spec['x-tagGroups'].length > 0) {
  items.push(
  ...MenuBuilder.getTagGroupsItems(parser, undefined, spec['x-tagGroups'], tagsMap, options),
  );
  