fix syntax error in previous commit. and issue 12: empty optional fields should not be sent
fix syntax error in previous commit. and issue 12: empty optional fields should not be sent

ajf8/mcomaster,spandeyindia/mcomaster,spandeyindia/mcomaster,spandeyindia/mcomaster,spandeyindia/mcomaster,ajf8/mcomaster,ajf8/mcomaster