Fix：5176 【商城小程序】省级导航在搜索无效名称时无反馈

(cherry picked from commit 956d7bf70b)

pages/chose-city/chose-city.vue

@@ -385,7 +385,7 @@ export default {
     },
     search() {
       if(this.keyword === '') return
-      this.listGroup.findIndex((group, index) => {
+      const matchIndex = this.listGroup.findIndex((group, index) => {
         let result
         group.city.forEach(item => {
           result = item.cityName.indexOf(this.keyword, 0)
@@ -398,6 +398,12 @@ export default {
           return result
         }
       })
+      if (matchIndex === -1) {
+        uni.showToast({
+          title: '未找到该城市，请重新输入城市名称',
+          icon: 'none'
+        })
+      }
     },
     select(item) {
       if (this.type === 0 && item.hasData === 0) return