Raise 400 on missing data rather than assertion. Fix for https://www.pivotaltracker.com/story/show/148716703
Raise 400 on missing data rather than assertion.
Fix for https://www.pivotaltracker.com/story/show/148716703

uwcirg/true_nth_usa_portal,uwcirg/true_nth_usa_portal,uwcirg/true_nth_usa_portal,uwcirg/true_nth_usa_portal