The phrase "moot question" refers to a topic or question that is no longer relevant or does not need to be answered, because the situation has changed or it is not important anymore. Full definition
Early Lutheranism never let its critical theological distinction between justification and sanctification moot the question of ethics, as a cursory reading even of the hymnody would reveal. (firstthings.com)
There is a separate and distinct possibility, that one of the forms you signed actually signed away your rights (which would moot the question about you benig an employee). (law.stackexchange.com)
Lord Phillips's approach renders moot any question of the intention of the parties as to recovery. (newlawjournal.co.uk)