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Помогите реализовать вывод изображения "продано" в категориях

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Добрый вечер! У меня OpenCart Появилась необходимость реализовать вывод надписи "продано" поверх изображения, после окончания товара на складе. В catalog\model\catalog\product.php добавил эту строчку

'quantity'			  => $product_option_value['quantity'],

в catalog\controller\product\category.php добавил вот эту строчку

'quantity'=> $result['quantity'],

в catalog\view\theme\default\template\product\category.tpl добавил вот это код

		  <?php if ($products ['quantity']>0) { ?>
		  <?php } else { ?>
		 <div class="my-prodano"></div>
		  <?php } ?>

В результате выскакивает ошибка :


: Undefined index: quantity in



Подскажите пожалуйста как это вылечить?

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