projecttacoma/bonnie — pull request #233 by jtferns (2014-04-09 14:05:27+00:00)
Title: Fix coverage calculation for empty logic element populations

#### Story ####
- https://www.pivotaltracker.com/story/show/69113542

#### Notes ####
- if a patient population has "None" or no logic elements, the coverage calculation does not compute up to 100% because the population in question does not have a key attribute
- verified with CMS52v2, where a patient can meet all logic element criteria and not achieve 100% without this fix