This is something that could be controlled on the applicable template file. There is a small amount of existing control to show fields all the time or not, you would want to add your data check at the same point that that check is performed if the display is true and there is data (zen_not_null($mydata)) then display that field.

See: includes/templates/YOUR_TEMPLATE/templates/tpl_product_music_info.php for starters. If not already in that folder, then copy the file of the same name from includes/templates/template_default/templates before editing.