Fix empty email body with CiviCRM 5.51
In CiviCRM 5.51 API3 Contact.get no longer returns preferred_mail_format
because of https://github.com/civicrm/civicrm-core/pull/23565
In CiviCRM 5.51 API3 Contact.get no longer returns preferred_mail_format
because of https://github.com/civicrm/civicrm-core/pull/23565