fix: Hide asset users from users list page (coronasafe#2107)

care/users/api/viewsets/users.py

@@ -12,6 +12,7 @@
 from rest_framework.response import Response
 from rest_framework.serializers import ValidationError
 from rest_framework.viewsets import GenericViewSet
+from django.db.models import Q
 
 from care.facility.api.serializers.facility import FacilityBasicInfoSerializer
 from care.facility.models.facility import Facility, FacilityUser
@@ -89,6 +90,9 @@ class UserViewSet(
             created_by_user=F("created_by__username"),
         )
     )
+    queryset = queryset.filter(Q(asset__isnull=True))
+
+
     lookup_field = "username"
     lookup_value_regex = "[^/]+"
     permission_classes = (