To test:
1 - go to a patron detail view, click "add guarantee"
2 - Confirm form loads
3 - Confirm categories lsited are eligible to have a guarantor
4 - Fill out required fields and confirm patron saved correctly
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
