fix error.code )

Signed-off-by: Sergey V. Osipov <sipopo@yandex.ru>

Author: sipopo

src/setup_node_env/node_version_validator.test.js

@@ -103,7 +103,7 @@ function testValidateNodeVersion(done, versionToTest, expectError = false, expec
 
       expect(stderr).toStrictEqual(speficicErrorMessage);
     } else if (expectWarning) {
-      expect(error.code).toBeNull();
+      expect(error).toBeNull();
 
       var speficicWarningMessage =
         `You're using an untested version of Node.js. OpenSearch Dashboards has been tested to work with Node.js ` +