Stanford-Online/edx-platform — pull request #158 by dcadams (2014-11-06 18:03:01+00:00)
Title: Fixes 3 issues:

- undefined and NAN% was being displayed in text when student data didn't include correct or incorrect.
- Items in radio display numbered incorrectly when student data missing options at the beginning.
- Mouseover text included text from the correct and incorrect span.