Remove a assert that generate false positives.

It is valid to return 'None' value as the transaction information is not
present on all storage node concerned by the transaction.
Update related test.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1721 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/storage/transactions.py

@@ -83,7 +83,6 @@ class Transaction(object):
         return self._object_dict.keys()
 
     def getTransactionInformations(self):
-        assert self._transaction is not None
         return self._transaction
 
 
@@ -137,6 +136,8 @@ class TransactionManager(object):
         for oid in transaction.getOIDList():
             self._load_lock_dict[oid] = tid
         object_list = transaction.getObjectList()
+        # txn_info is None is the transaction information is not stored on 
+        # this storage.
         txn_info = transaction.getTransactionInformations()
         # store data from memory to temporary table
         self._app.dm.storeTransaction(tid, object_list, txn_info)

neo/tests/storage/testTransactions.py

@@ -44,7 +44,6 @@ class TransactionTests(NeoTestBase):
 
     def testTransaction(self):
         txn = Transaction(self.getNewUUID(), self.getNextTID())
-        self.assertRaises(AssertionError, txn.getTransactionInformations)
         oid_list = [self.getOID(1), self.getOID(2)]
         txn_info = (oid_list, 'USER', 'DESC', 'EXT')
         txn.prepare(*txn_info)