Index: t3lib/matchcondition/class.t3lib_matchcondition_abstract.php
===================================================================
--- t3lib/matchcondition/class.t3lib_matchcondition_abstract.php	(revision 7555)
+++ t3lib/matchcondition/class.t3lib_matchcondition_abstract.php	(working copy)
@@ -345,6 +345,10 @@
 							return true;
 						}
 					}
+				} else {
+					if ($value === '') {
+						return TRUE;
+					}
 				}
 			break;
 			case 'globalVar':