Change in mitxonline API leads to published courses with no published runs

[mbertrand]

Steps to Reproduce

• Run manage.py backpopulate_mitxonline_data
• Go to https://discussions-rc.odl.mit.edu/learn/search?o=MITx&q=%22Designing%20and%20Running%20Randomized%20Evaluations%22 and click the link for the 1st result

Expected Behavior

Sidebar opens with details of course and run start date.

Actual Behavior

Blank sidebar.

Related Issues

This is because the current code is determining if a run is published or not by looking for a {"page" : {"url": :<value>}} element in the API response. But that no longer exists, there is now only one such element at the course level. This is being fixed for mit-open but not here yet.