--- a/server/schemahooks.py	Fri Jun 05 16:41:09 2009 +0200
+++ b/server/schemahooks.py	Fri Jun 05 18:54:39 2009 +0200
@@ -572,6 +572,7 @@
             constraints = self.rschema.rproperty(etype, atype, 'constraints')
             coltype = type_from_constraints(adbh, atype, constraints,
                                             creating=False)
+            # XXX check self.values['cardinality'][0] actually changed?
             sql = adbh.sql_set_null_allowed(table, column, coltype,
                                             self.values['cardinality'][0] != '1')
             self.session.system_sql(sql)

--- a/server/sources/native.py	Fri Jun 05 16:41:09 2009 +0200
+++ b/server/sources/native.py	Fri Jun 05 18:54:39 2009 +0200
@@ -5,7 +5,7 @@
   from which it comes from) are stored in a varchar column encoded as a base64
   string. This is because it should actually be Bytes but we want an index on
   it for fast querying.
-  
+
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 :contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr