Overly persistent choices

[emilymbender]

As reported by a student in 567:

While adding Wh- Questions, we came across an issue on the customization page. We wanted question phrases to not be able to be fronted, thus having no answer to the second question. But, when we clicked on the options in the second question, we were unable to unselect an answer.

We plan to restart our changes from the last downloaded version we have and just not select anything for that question, but it would be a nice feature to be able to clear a question/unselect an answer!