解决品牌筛选错误

@@ -2,7 +2,7 @@
  * @Author: Targaryen
  * @Date:   2016-05-25 18:16:59
  * @Last Modified by:   Targaryen
- * @Last Modified time: 2016-05-27 18:58:00
+ * @Last Modified time: 2016-05-30 10:38:17
  */
 
 'use strict';
@@ -164,10 +164,12 @@ exports.handleSaleFilterData = (origin, params) => {
             brand.name = value.brand_name;
             brand.key = value.brand_domain;
 
-            if (!_.isNaN(parseInt(value.brand_alif, 10))) {
-                brand.index = '0-9';
-            } else {
-                brand.index = value.brand_alif.toLowerCase();
+            if (!_.isEmpty(value.brand_alif)) {
+                if (!_.isNaN(parseInt(value.brand_alif, 10))) {
+                    brand.index = '0-9';
+                } else {
+                    brand.index = value.brand_alif.toLowerCase();
+                }
             }
 
             if (count < 10) {