The loadBefore implementation must return None for an unknown OID.

See RevisionTests.checkLoadBeforeCreation test case.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1804 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/Storage.py

@@ -87,7 +87,7 @@ class Storage(BaseStorage.BaseStorage,
         try:
             return self.app.loadBefore(oid=oid, tid=tid)
         except NEOStorageNotFoundError:
-            raise POSException.POSKeyError (oid, tid)
+            return None
 
     def iterator(self, start=None, stop=None):
         return self.app.iterator(start, stop)