'Ignoration' does exist, or at least can be found in your better-stocked antiquarian dictionary, but I've never seen it used. It's an Englishing of a technical term in philosophy, which only occurs in ignoratio elenchi, which is the fallacy of "ignoring the question" (or "ignorance of the issue"), i.e. arguing for something other than what you're supposed to be arguing for.

That said, 'ignoral' seems a reasonable coining, on the analogy of 'referral'.