But in saying it this way, you're attempting to imply you can provide evidence. And I am simply pointing out that there is no reason to even consider that this is a possibility. Don't tell me you will do it later, because that's irrelevant. It's no different than saying nothing at all, or even saying "I have no evidence" or "I cannot provide evidence." They are all exactly equivalent in the end, except that the other methods do not have the implication that you might actually provide the evidence, despite you not giving us a reason to believe that, so it smacks of dishonesty.
Just say nothing at all, unless you have something to contribute. You'll be better off.