商品入仓页，选择品牌时第一次不能选择无，先选其他品牌再选择无才可以

http://zentao.jdshangmen.com/bug-view-998.html

src/views/ecw/order/warehousing/components/editDialog.vue

@@ -421,7 +421,7 @@ export default {
       opened: false,
       brandList: [],
       form: {
-        // "brand": "0",
+        "brand": "",
         // "brandType": 0,
         // "inTime": "",
         // "material": "",