--- node.module.4.7	2006-12-06 22:20:21.000000000 +0100
+++ node.module.4.7.404	2006-12-06 22:31:59.000000000 +0100
@@ -2103,9 +2103,12 @@
         }
       }
       break;
-    default:
+    case '':
       drupal_set_title('');
       return node_page_default();
+    default:
+      drupal_not_found();
+      return;  
   }
 }