--- Comment #2 from Andrew Green <andrew.green...@gmail.com> ---
It looks like this is due to two attempts to remove the same article
assignment. The second attempt, which I think triggered the error, was likely
done from a stale version of the course page.
To reproduce the error:
1. On a course page, assign an article to a student
2. Open a refreshed version of the page in two browser tabs.
3. In one of the tabs, remove the article assignment.
4. In the other tab, without refreshing the page, try to remove the same
article assignment again.
Assuming this is what happened, this bug should be something like: handle
non-existent article assignment ids remove article (assignment) actions.
Note that on my local install, I got several additional related errors just
before the error and stack trace mentioned above.
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