theme_options_none($variables)Theme the label for the empty value for options that are not required. The default theme will display N/A for a radio list and blank for a select.
modules/field/modules/options/options.module, line 371
<?php
function theme_options_none($variables) {
$instance = $variables['instance'];
switch ($instance['widget']['type']) {
case 'options_buttons':
return t('N/A');
case 'options_select':
return t('- None -');
default :
return '';
}
}
?>