When considering whether a subsection is complete as an assignment, skip any "hierarchy" types (sequential, vertical, etc) that don't have children. If the user can't see the content, don't risk marking it as complete. AA-726
Open EdX Features ----------------- This is the root package for Open edX features that extend the edX platform. The intention is that these features would ideally live in an external repository, but for now they live in edx-platform but are cleanly modularized.