fix backward compatibility for mailchimp sync for CiviCRM 5.28.
Mailchimp sync config page is not loaded properly for CiviCRM 5.28 since the CONTAINS is not supported by api yet. The patch make sure it loads without breaking anything.
Mailchimp sync config page is not loaded properly for CiviCRM 5.28 since the CONTAINS is not supported by api yet. The patch make sure it loads without breaking anything.