Fix a bug that prevents the session from loading in rare cases.

application/modules/requests/models/RequestModel.php

@@ -771,6 +771,9 @@ class Requests_RequestModel extends Unl_Model
     
     public function __wakeup()
     {
+    	if (!is_array($this->_data['files'])) {
+    		$this->_data['files'] = array();
+    	}
         foreach ($this->_data['files'] as &$file) {
         	if ($file['data']) {
         		continue;