refactor: 第三方平台用户登录异常修复

@@ -173,8 +173,8 @@ public class YtThirdPlatformServiceImpl extends AbstractBaseService<YtThirdPlatf
 
     @Override
     public UserDTO login(String thirdUserId) {
-        return baseMapper.login(thirdUserId)
-                .getDTO(UserDTO.class);
+        User user = baseMapper.login(thirdUserId);
+        return user==null?null:user.getDTO(UserDTO.class);
     }
 
     @Override