CardHolderResponseDescription not output on failed transaction

The CardHolderResponseDescription is not being output with the error message on a declined transaction, even though I can see in the logs that it exists in the xml. (I believe this applies to both PXPost and PXPay but its PXPost that we need fixed).

The relevant code is at commerce_dps_pxpost.module on line 533:

drupal_set_message(t('We received the following error processing your card. Please enter your information again or try a different card.'), 'error');
drupal_set_message(check_plain((string)$xml->CardHolderResponseDescription), 'error');