[-] BO : fix bug #PSCFV-2897 - JS error on combination page

git-svn-id: http://dev.prestashop.com/svn/v1/branches/1.5.x@16119 b9a71923-0436-4b27-9f14-aed3839534dd

js/admin-products.js

@@ -527,6 +527,8 @@ product_tabs['Prices'] = new function(){
 			context: this,
 			async: false,
 			success: function(data) {
+				if (data !== null)
+				{
 					if (data.status == 'ok')
 					{
 						showSuccessMessage(data.message);
@@ -535,6 +537,7 @@ product_tabs['Prices'] = new function(){
 					else
 						showErrorMessage(data.message);
 				}
+			}
 		});
 	};