Prevent fatal error on null values

Author: thomas-pike

core.php

@@ -115,6 +115,7 @@ function path_join(...$args) {
 * @param integer $escaping method of escaping to use
 */
 function out($string, $escaping = ESC_HTML) {
+	if(is_null($string)) return '';
 	switch($escaping) {
 	case ESC_HTML:
 		echo htmlspecialchars($string);