Employer Contract NOC in Qatar

Hi all,
I got an opportunity to work with a company in Qatar. Initially we had agreed for a fixed term contract of one year but when the employer sent the draft offer letter/contract the duration was not clear and it seems to be an open ended contract.The employer is not willing to mention the duration as 1 year in the contract. And he said he can not include in the contract about providing NOC if I resign after one year. He had sent an email about providing NOC in case if I resign after one year.
Can I use this email as a proof to get a NOC if I resign after one year? Or can he deny NOC saying it is not included in the contract. Please reply guys. Thanks in advance.
Thanks & regards,
Prathap K