修复订单列表页product_name不存在时会报错的bug；修复订单详情页快递单号不存在会报错的bug

Code Review By Rock Zhang

@@ -583,7 +583,7 @@ class Helpers
 
         foreach ($orderGoods as $key => $vo) {
             $arr[$key]['thumb'] = Helpers::getImageUrl($vo['goods_image'], 90, 120);
-            $arr[$key]['name'] = $vo['product_name'];
+            $arr[$key]['name'] = isset($vo['product_name']) ? $vo['product_name'] : '';
             $arr[$key]['color'] = $vo['color_name'];
             $arr[$key]['size'] = $vo['size_name'];
             $arr[$key]['price'] = $vo['goods_price'];

@@ -331,13 +331,19 @@ class OrderModel
         return $result;
     }
 
+    /**
+     * 获取快递有关信息
+     * @param boolean $showLogistics 是否显示
+     * @param array $order 订单信息
+     * @param array $result
+     */
     private static function assignExpressInfo($showLogistics, $order, &$result)
     {
         $result['logisticsUrl'] = Helpers::url('/home/logistic', array('order_code' => $order['order_code']));
 
         if ($showLogistics && isset($order['express_company']['caption'])) {
             $result['logisticsCompany'] = $order['express_company']['caption'];
-            $result['logisticsNum'] = $order['express_number'];
+            $result['logisticsNum'] =  isset($order['express_number']) ? $order['express_number'] : '';
         }
     }