While this bug was already present in the general admin search, the
combination of both search and filters was very uncommon. I've only
found this combinations in the users section, where you've got the
"erased" filter, but in this case searching for erased users doesn't
really make sense since their username and email have been deleted and
so there's nothing to find.
So the hidden content seemed to be the only affected section. However,
we're adding the field to every section so we don't have to make sure we
add it when we need it (like we did in the SDGManagement section).
