Don't send unnecessary empty query parameters to the facility user endpoint

[marcellamaki]

Observed behavior

There are instances where there are empty query params being sent to the facility user endpoint

e.g. http://127.0.0.1:8080/api/auth/facilityuser/?member_of=4839d1a0688cc1e8f01fac813f5b1da8&page_size=30&page=3&search=65&exclude_member_of=&user_type=&exclude_user_type=&1651856395778=1651856395778

Expected behavior

Should not send empty query params

[rtibbles]

Fixed in #9422