Fix answer checking for questions with select all that apply. Previous change fixed the behavior where it would accept any answer that included all correct answers but introduced the issue that it would treat as correct any answer that selected no incorrect answers. Now it properly will only mark correct if all correct answers are selected.
Fix answer checking for questions with select all that apply. Previous change fixed the behavior where it would accept any answer that included all correct answers but introduced the issue that it would treat as correct any answer that selected no incorrect answers. Now it properly will only mark correct if all correct answers are selected.