Index: formencode/compound.py
===================================================================
--- formencode/compound.py	(revision 1722)
+++ formencode/compound.py	(working copy)
@@ -162,6 +162,6 @@
     def not_empty__get(self):
         not_empty = False
         for validator in self.validators:
-            not_empty = not_empty or validator.not_empty
+            not_empty = not_empty or getattr(validator, 'not_empty', False)
         return not_empty
     not_empty = property(not_empty__get)