调整第三方解绑方法

app/controller/api/user/User.php

@@ -2653,8 +2653,10 @@ class User extends BaseController
                     throw new \Exception("此微信号已被其他用户绑定");
                 }
                 $check = Db::name('user_extract_openid')->where('uid',$uid)->value('openid');
-                if (!empty($check) && $check != $openid){
-                    throw new \Exception("您已绑定其他微信号");
+                if (!empty($check)){
+                    if ($check != $openid) {
+                        throw new \Exception("您已绑定其他微信号");
+                    }
                 } else {
                     Db::name("user_extract_openid")->insert([
                         'uid' => $uid,