Hi @pjeaje
By default, no.
However, you could hook into the image update_value action and look for an empty value. If found, you could lookup the old value (get_field) and then use the ID to remove it from the DB completely.
You can target all image update_value actions like so:
function my_acf_update_value( $value, $post_id, $field )
{
// do something else to the $post object via the $post_id
return $value;
}
add_filter('acf/update_value/type=image', 'my_acf_update_value', 10, 3);
Learn more:
http://www.advancedcustomfields.com/resources/filters/acfupdate_value/
