Question Set question cannot be answered once 'check' clicked, even if no option selected
In Quiz (Question Set), where 'Retry' is disabled in a true/false and multiple-choice where the student hasn't selected an answer but clicks 'check' they are then unable to answer the question.
It would be desireable that the 'check' button is disabled until an attempt to answer had been made to improve the UX as disabling re-try prevents students 'gaming' rather than engaging with content.
Multiple choice: https://h5p.org/node/365972
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