完善注册

application/api/controller/User.php

@@ -1270,7 +1270,7 @@ class User extends Api
             }
         }
         //查询是否需要给上级发放优惠券
-        if ($invite_info) {
+        if (isset($invite_info)) {
             //查询上一次获得推广优惠券时间
             $last_coupon = Db::name('user_coupon')->where(['user_id' => $invite_info['id'], 'purpose' => 2])->order('id', 'desc')->find();
             $last_coupon_time = $last_coupon ? $last_coupon['createtime'] : 0;