Fix "List index out of range" for sorted_aligned_effects

[Svenstar74]

Describe the bug

The problem occurs when I complete the quiz as a userB. It doesn't happen always but very often for me.
The backend responds with a 500 error, which also breaks the frontend, because there are no alignment scores, etc. to display.

When I have the backend running locally, I get the error message, that the list index is out of range for sorted_aligned_effects[2] in line 44 below. If I print the sorted_aligned_effects list, I indeed can see that there are only two entries.

To Reproduce

Here's a video that shows me reproducing it.
Please note, that it also happens for other combinations of answers. Selecting always the first answer is just more reliable for me to get the error.

2023-12-13.21-44-15.mp4

Expected behavior

I would assume that the fix would involve to guarantee that the list always has three items, so that the api call doesn't fail.

Task

• Investigate why the sorted_aligned_effects sometimes has only two values instead of the expected three?