Challenge Details: Only details tab present

Only details tab present in All Challenges: <img width="1440" alt="Screenshot 2020-05-19 at 6 34 31 PM" src="https://user-images.githubusercontent.com/58783823/82329764-6cd79780-99ff-11ea-9b54-4ac2bae7f014.png">

Clicking on Winners tabs in past challenges loads a blank page <img width="1440" alt="Screenshot 2020-05-19 at 6 35 11 PM" src="https://user-images.githubusercontent.com/58783823/82329827-82e55800-99ff-11ea-8941-329839c1cfe9.png">

Final Submission Guidelines

Git issue link: https://github.com/topcoder-platform/community-app/issues/4381