No user output shown in online editor

To whom it may concern,

I have updated the online test runner yesterday and since that, no user output is shown in the results tab of the online editor. The user output is required by students to have a means of debugging. Students using the CLI are not seeing this issue. I am working on a solution.

Technical details are provided in this GitHub issue. There where no tests for handling user output correctly, so we missed that problem beforehand.