Description of problem:

Steps to replicate the issue (include links if applicable):

Create an event with participant questions
Register ten users for the event
Change the event end date to a date in the past
Aggregate the event
As the organizer, delete all of the participants
View the response statistics tab

What happens?:
on local, an Internal error
[427c49762d1190746d508d93] /wiki/Special:EventDetails/329 DivisionByZeroError: Division by zero

on prod it is a more graceful failure, but still inaccurate:
Between Non-Number% and −∞% or Between 0 and −9

What should have happened instead?:

I'm not sure how it should be handled. Should the participants response tab still be displayed even if there are no participants?

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):
1.44.0-alpha (5be2826)
17:26, 25 February 2025

Other information (browser name/version, screenshots, etc.):

local	ms.wiktionary.org

Acceptance Criteria:

• Do not display response statistics tab when all participants unregistered