custom conditional placeholder is_frontend

add_action('em_event_output_condition', 'my_em_frontend_event_output_condition', 1, 4);
function my_em_frontend_event_output_condition($replacement, $condition, $match, $EM_Event){
	if( is_object($EM_Event) && preg_match('/^is_frontend$/',$condition, $matches) && is_array( $EM_Event->styles ) ){
		if( !empty($EM_Event->event_owner_anonymous) ){
			$replacement = preg_replace("/\{\/?$condition\}/", '', $match);
		}else{
			$replacement = '';
		}
	}
	return $replacement;
}