It seems to me I received an e-mail about 1 year ago advising that no shows would not receive a nights credit or points. I have never had this happen to me so I can't say for sure if you would not receive credit.
About 4 months I booked the wrong date on a non-refundable rate in London , called the hotel a week later when I realized my mistake, and they refunded the money to my credit card
. I was very happy. You could call the hotel directly and ask .