как сделать заглушку при отсутсвии картинок в opencart (noimage)

foreach ($results as $result) {
if ($result['image']) {
$image = $this->model_tool_image->resize($result['image'], $this->config->get('config_image_product_width'), $this->config->get('config_image_product_height'));
} else {
$image = $this->model_tool_image->resize('no_image.jpg', $this->config->get('config_image_product_width'), $this->config->get('config_image_product_height'));

//$image =false;
}