Fix bug in btngroup anchoring when anchor doesn't exist

Change-Id: Id89aa31edf6d9ee06046b22f6f4cefa34366f46e
diff --git a/Changes b/Changes
index 24aebd0..edb7691 100755
--- a/Changes
+++ b/Changes
@@ -1,4 +1,4 @@
-0.43 2021-09-15
+0.43 2021-09-24
         - New menu class that has an entry at the very end,
           similar to the input text prefix,
           that is always available. (lerepp)
@@ -31,6 +31,7 @@
         - Add plugin service to redirect to a certain location.
         - Add support for pagination information to retrieve by plugins.
         - Buttongroup menus can be opened at different positions.
+        - Fix buttongroup anchoring if anchor doesn't exist.
 
 0.42 2021-06-18
         - Added GitHub based CI for perl.