Ansible check for a file using stat in loop

[Prudhvi]

I'm using stat module in loop to search for a file when defined.

- name: Check for .pub file
  stat:
    path: "{{ playbook_dir }}/../vars/{{ item.name }}.pub"
  loop: "{{ UserAddList.add_users }}"
  register: file_details
  when: item.authorized_keys is defined and item.authorized_keys != ""
  no_log: true

- name: Fail if .pub key doesn't exist
  fail:
    msg: '{{ item.item.name }} does not have to public key {{ item.item.name }}.pub in the path {{ item.item.authorized_keys }} file'
  when: item.stat.exists == false or item.stat.exists is not defined
  loop_control:
   label: "{{ item.stat }}"
  with_items: "{{ file_details.results }}"

Input file:

add_users:
- name: test1_123
  group: test123
  password: test1_newcdsaf
  authorized_keys: "{{ playbook_dir }}/../vars/test1_123.pub"
- name: test1_1234
  group: test234
  password: test1_newcdsaf
  authorized_keys: ""

My input file will have an user entry with optional authorized keys field

Conditions to fail.

The playbook has to fail when authorized_keys is defined and the .pub key is present on in the location. I'm using stat module to search for the file.

The playbook should not fail when authorized_keys field is empty as it is valid case.

right now my playbook is failing when authorized_keys is empty. This is happening because of the loop.

for the item where the authorized_keys is not defined, I'm seeing the below output.

                "skip_reason": "Conditional result was False",
                "skipped": true

When authorized_keys is defined.I'm seeing the stat variable in output

                "stat":
                    "exists": false

Please provide any suggestions to fix this.
Thank you