Revert changes to client.storage.Storage.load from r2510.

It broke ZODB tests.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2521 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/Storage.py

@@ -68,7 +68,10 @@ class Storage(BaseStorage.BaseStorage,
             compress=compress)
         self._cache = DummyCache(self.app)
 
-    def load(self, oid, version):
+    def load(self, oid, version=''):
+        # XXX: interface deifinition states that version parameter is
+        # mandatory, while some ZODB tests do not provide it. For now, make
+        # it optional.
         assert version == '', 'Versions are not supported'
         try:
             return self.app.load(oid=oid)