Parameter validation not working

[b0tting]

Hi! I noticed the parameter validation structure used in this role (and other controller roles) might not have been set up correctly. This causes my playbooks to fail with vague errors. This might be an ansible version related issue.

If I change this line in nginxinc.nginx_controller_user_role/tasks/main.yml on line 5:
that: ("{{ item }} is defined") and ("{{ item }} | length > 0")
To:
that: item is in vars and vars[item] | length > 0
..validation works as expected

My version info:

ansible [core 2.11.2]
  config file = None
  configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.8/dist-packages/ansible
  ansible collection location = /root/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/local/bin/ansible
  python version = 3.8.10 (default, Jun  2 2021, 10:49:15) [GCC 9.4.0]
  jinja version = 2.10.1
  libyaml = True