Read function inconsistent between orm and orm_memory

In orm.py:

The function read in orm object is designed to return a single dictionnary if the argument 'ids' is a single id and a list of dictionnary if 'ids' is itself a list.

The function read in orm_memory seems to have been designed to do the same but currently it can only return a list:

'ids' is tested at the beginning but is also modified:
            if isinstance(ids, (int, long)):
                ids = [ids]
making the last check located a few lines later totally useless:
            if isinstance(ids, (int, long)):
                return result[0]

An easy patch is attached (I tested it quickly).