fix The create user is always loading when the queue does not select any value

dolphinscheduler-ui/src/js/conf/home/pages/security/pages/users/_source/createUser.vue

@@ -229,12 +229,18 @@
       },
       _submit () {
         this.$refs['popup'].spinnerLoading = true
+
+        let queueCode = '';
+        //get queue code
+        if (this.queueName != ''){
+          queueCode = this.queueList.length > 0 ? _.find(this.queueList, ['id', this.queueName]).code : ''
+        }
         let param = {
           userName: this.userName,
           userPassword: this.userPassword,
           tenantId: this.tenantId,
           email: this.email,
-          queue: this.queueList.length>0? _.find(this.queueList, ['id', this.queueName]).code : '',
+          queue: queueCode,
           phone: this.phone
         }