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Multiple choice question: reject "no box checked" as an answer
Currently, this is rejected/scored with zero with "no answer provided".
Given https://designnotes.blog.gov.uk/2021/11/15/letting-users-tick-a-none-checkbox/, allowing all-empty might be bad practice. Given that, MultipleChoiceQuestion should reject all-empty answers. (And this should be documented.)
This probably needs a deprecation period.