download: provide description for an assertion error on attempts_allowed_or_not #1550
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Somehow, with some prior version of the code, but we did get this assertion triggered as shown in
#1549 (comment) although it remains unclear how that could have happened if type checking is correct since we must not end up there with None or even 0.
Unfortunately with a regular assert we just get an announcement of the fact and no details. After this change we hope to be able to see more details which might hint on the original issue.