--- a/Tools__NewSystemBrowser.st	Mon Nov 04 18:10:01 2019 +0100
+++ b/Tools__NewSystemBrowser.st	Mon Nov 04 18:12:31 2019 +0100
@@ -23566,6 +23566,7 @@
 hasRedoableOperations
     |manager|
 
+    RefactoryChangeManager isNil ifTrue:[^ false].    "/   returns false if the class is not present
     manager := RefactoryChangeManager instance.
     manager isNil ifTrue:[^ false].
     ^ manager hasRedoableOperations