Smart-Acc e-Support

- Fix when already DocNo is complete, didn't return response error code or message.
- GetDirectCashSale, Fix NullExceptionError when getting back existing DocumentNo info but there is no record in AcCSM or AcCSD.

- Fix GetDirectCashSales, Get DocumentNo didn't return Detail when using HoldBillNo(ReceiptNo).
- Fix GetDirectCashSales, Not returning Barcode field when is Non-Stock Modifier item detail.

- Get OutOfStock using Barcode Request, now will return 404 NOT FOUND if barcode do not exist in POS database.