}
/**
- * @param string $suffix
+ * Check template file exists.
*
- * @return null|string
+ * @param string|null $suffix
+ *
+ * @return string|null
+ * Template file path, else null
*/
- public function checkTemplateFileExists($suffix = '') {
+ public function checkTemplateFileExists($suffix = NULL) {
if ($this->_gid) {
$templateFile = "CRM/Profile/Page/{$this->_gid}/Listings.{$suffix}tpl";
$template = CRM_Core_Page::getTemplate();