Index: trunk/core/kernel/utility/unit_config_reader.php
===================================================================
diff -u -r2613 -r2792
--- trunk/core/kernel/utility/unit_config_reader.php	(.../unit_config_reader.php)	(revision 2613)
+++ trunk/core/kernel/utility/unit_config_reader.php	(.../unit_config_reader.php)	(revision 2792)
@@ -125,6 +125,12 @@
 			{
 				$clone_config['Prefix'] = $clone_prefix;
 				$this->configData[$clone_prefix] = array_merge_recursive2($this->configData[$prefix], $clone_config);
+				
+				foreach($clone_config as $cloned_property => $cloned_value)
+				{
+					if(!$cloned_value) unset($this->configData[$clone_prefix][$cloned_property]);
+				}
+				
 				$this->ParseConfigClones($clone_prefix);
 			}
 		}