docs: def get_public_comments_for_model(model):
      """
      Get visible comments for the model.
      """
      if not IS_INSTALLED:
          # No local comments, return empty queryset.
          # The project might be using DISQUS or Facebook comments instead.
          return CommentModelStub.objects.none()
      else:
          return CommentModel.objects.for_model(model).filter(is_public=True, is_removed=False)