🐛Added empty condition to solve the conflict with CartFlows and Google Site Kit.

Summary

Added empty condition to solve the conflict with CartFlows and Google Site Kit.

While using the latest version of this plugin with the CartFlows plugin, there is an Fatal/Critical error is getting generated on the thank you page created by CartFlows.

This issue is getting initiated from the WooCommerce action woocommerce_thankyou action hook. In the callback function, there is a check to confirm that the order_key is valid or not.

Before this check, the $order_key added on line number 94 is returning blank and that what is triggering the Fatal/Critical error.

The code: $order->key_is_valid( $order_key ) File location: includes/Core/Conversion_Tracking/Conversion_Event_Providers/WooCommerce.php Line number: 97

Addresses issue:

#9276

Relevant technical choices

There was a missing empty condition before checking the has_key is correct or not.

PR Author Checklist

[x] My code is tested and passes existing unit tests.
[ ] My code has an appropriate set of unit tests which all pass.
[x] My code is backward-compatible with WordPress 5.2 and PHP 7.4.
[x] My code follows the WordPress coding standards.
[x] My code has proper inline documentation.
[x] I have added a QA Brief on the issue linked above.
[x] I have signed the Contributor License Agreement (see https://cla.developers.google.com/).

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Code Reviewer Checklist

[ ] Run the code.
[ ] Ensure the acceptance criteria are satisfied.
[ ] Reassess the implementation with the IB.
[ ] Ensure no unrelated changes are included.
[ ] Ensure CI checks pass.
[ ] Check Storybook where applicable.
[ ] Ensure there is a QA Brief.

Merge Reviewer Checklist

[ ] Ensure the PR has the correct target branch.
[ ] Double-check that the PR is okay to be merged.
[ ] Ensure the corresponding issue has a ZenHub release assigned.
[ ] Add a changelog message to the issue.

google / site-kit-wp