Index: branches/RC/core/kernel/nparser/nparser.php
===================================================================
diff -u -r11373 -r11374
--- branches/RC/core/kernel/nparser/nparser.php	(.../nparser.php)	(revision 11373)
+++ branches/RC/core/kernel/nparser/nparser.php	(.../nparser.php)	(revision 11374)
@@ -616,7 +616,7 @@
 
 	function CheckNoData(&$ret, $params)
 	{
-		if (isset($params['data_exists']) && !$this->DataExists) {
+		if (array_key_exists('data_exists', $params) && $params['data_exists'] && !$this->DataExists) {
 			$block_no_data = isset($params['BlockNoData']) ? $params['BlockNoData'] : (isset($params['block_no_data']) ? $params['block_no_data'] : false);
 			if ($block_no_data)	{
 				$ret = $this->ParseBlock(array('name'=>$block_no_data));