Fixed #4425 Variable is initialized as string but later written to as array, throws fatal error in PHP 7.1

Author: Till Brehm

interface/lib/classes/listform_actions.inc.php

@@ -131,7 +131,7 @@ public function onLoad()
 		$records = $app->db->queryAllRecords($this->getQueryString($php_sort));
 
 		$this->DataRowColor = "#FFFFFF";
-		$records_new = '';
+		$records_new = array();
 		if(is_array($records)) {
 			$this->idx_key = $app->listform->listDef["table_idx"];
 			foreach($records as $rec) {

interface/lib/classes/tform_base.inc.php

@@ -173,7 +173,7 @@ function loadFormDef($file, $module = '') {
 		*/
 	protected function _decode($record, $tab = '', $api = false) {
 		global $app;
-		$new_record = '';
+		$new_record = array();
 		if($api == false) {
 			$table_idx = $this->formDef['db_table_idx'];
 			if(isset($record[$table_idx])) $new_record[$table_idx] = $app->functions->intval($record[$table_idx ]);