task: #3633353 Remove redundant render context lookup in Renderer::doRender()

      return '';

    }

    $context = $this->getCurrentRenderContext();

    if (!isset($context)) {

      throw new \LogicException("Render context is empty, because render() was called outside of a renderRoot() or renderInIsolation() call. Use renderInIsolation()/renderRoot() or #lazy_builder/#pre_render instead.");

    }

    $context->push(new BubbleableMetadata());

    // Set the bubbleable rendering metadata that has configurable defaults if