Challenge details: Registrants tab is loading a blank page

Challenge details: Registrants tab is loading a blank page example: https://beta-community-app.topcoder.com/challenges/3b25dfed-fea6-4999-8b9a-19a681e42202?tab=registrants <img width="1440" alt="Screenshot 2020-06-11 at 2 08 50 PM" src="https://user-images.githubusercontent.com/58783823/84363998-2388fb00-abed-11ea-8f49-c48cc283ec45.png">

Final Submission Guidelines

Git issue link: https://github.com/topcoder-platform/community-app/issues/4517