fix simple_eval for '' case; only query for options if it is None instead of []
fix simple_eval for '' case; only query for options if it is None instead of []

FormAlchemy/formalchemy,camptocamp/formalchemy,abourget/formalchemy-abourget,FormAlchemy/formalchemy,FormAlchemy/formalchemy,camptocamp/formalchemy,camptocamp/formalchemy,FormAlchemy/formalchemy,camptocamp/formalchemy