fix: 管理员登录租户账号空指针异常

@@ -170,7 +170,7 @@ public class TkThirdPlatformController extends BaseController {
     TkLoginResponse result = new TkLoginResponse();
     result.setToken(accessToken);
     result.setRefreshToken(refreshToken);
-    if(!isOpenApi){
+    if(null == isOpenApi || !isOpenApi){
       result.setThirdUserId(thirdUserId);
     }
     return result;