diff -r f13fbab0c718 -r 14159c600dad req.py
--- a/req.py	Tue Dec 17 11:50:12 2013 +0100
+++ b/req.py	Tue Dec 17 11:50:31 2013 +0100
@@ -111,7 +111,9 @@
         user specific value if any, else using site value
         """
         if self.user:
-            return self.user.property_value(key)
+            val = self.user.property_value(key)
+            if val is not None:
+                return val
         return self.vreg.property_value(key)
 
     def etype_rset(self, etype, size=1):