fix: Length of undefined on users warnings

[franciscofsales]

Description

On my instance, I was getting a frontend error where the were some issues with trying to check the length of undefined. I tracked it down to a function that was not completely checking its dependencies and just added a more extensive check that should prevent this issue from happening again.

I didn't find anyone else with the same issue but regardless, this PR is a tiny improvement.

This PR does not change any functionality or affect any of the existing ones

Screenshot (if UI-related)

To-Dos

N/A

Issues Fixed or Closed

Could not find anyone experiencing the same issue.