Submission error hints are not appearing for testruns

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When I tested it locally, only an empty box appeared:

[metenn]

Error hints not showing up for test runs was something I overlooked and thus they shouldn't show up at all, so the empty box is probably from something else? I couldn't replicate this empty box issue in any case.

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This isn't completed yet, as only the suspicious blue box has been fixed (by #355).
Testruns still don't have error hints.

[metenn]

I'm on it!

[twalen]

Why in the screenshot you have a comment:
"program exited due to signal 6"?

Both oioioi code & sioworkers code expect prefix:
"process exited due to signal "
(see https://github.com/sio2project/oioioi/blob/master/oioioi/programs/controllers.py#L740)

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Two quick rgs show that sioworkers are the culprit and program exited due to... also shows up in oioioi tests.