[-] BO : #PSCFV-3192 - Product::getAttributeGroups return duplicated attributes

git-svn-id: http://dev.prestashop.com/svn/v1/branches/1.5.x@16431 b9a71923-0436-4b27-9f14-aed3839534dd

classes/Product.php

@@ -2841,6 +2841,7 @@ class ProductCore extends ObjectModel
 				WHERE pa.`id_product` = '.(int)$this->id.'
 					AND al.`id_lang` = '.(int)$id_lang.'
 					AND agl.`id_lang` = '.(int)$id_lang.'
+				GROUP BY id_attribute_group, id_product_attribute
 				ORDER BY ag.`position` ASC, a.`position` ASC';
 		return Db::getInstance()->executeS($sql);
 	}