Fix：5174 【商城小程序】游客身份直接点击页面底部【客服】按钮并发送文字后，页面显示空白，且未弹出登录引导提示

(cherry picked from commit 55ed80acbc)

pages/shop/GoodsCon/index.vue

@@ -540,7 +540,7 @@ import {
   getProductSkuBySelected
 } from '@/api/store'
 import { userBindParent } from '@/api/user'
-import { handleQrCode, isWeixin } from '@/utils'
+import { handleLoginFailure, handleQrCode, isWeixin } from '@/utils'
 import { getHomeData } from '@/api/public'
 import {
   getDailyGoods,
@@ -878,6 +878,15 @@ export default {
       })
     },
     goRoom() {
+      if (!this.isLogin) {
+        uni.showToast({
+          title: '请先登录后联系客服',
+          icon: 'none',
+          duration: 2000
+        })
+        handleLoginFailure()
+        return
+      }
       console.log(this.storeInfo);
       const params = {
         goodsId: this.id,