Don't highlight validation error on write-in input unless input is mandatory and radio/checkbox is selected

[jrbarnes9]

Don't highlight validation error on write-in input unless input is mandatory and radio/checkbox is selected

The below example write-in input field shouldn't have a red border because it's radio hasn't been selected. Only if the radio is selected, and the write-in input is mandatory, should the input border be highlighted.

Screenshot of pattern example prototype

Originally posted by @jrbarnes9 in #30 (comment)