Describe the bug

I am trying to override juste one setting (server_names_hash_bucket_size) in the default main template.
Comments in the file state "# Defaults are the values found in a fresh NGINX installation." so I thought enabling nginx_config_main_template_enable and just overriding the right subkey would do the trick as it would keep the others values.

This didn't work, so I commented out my modification about the custom setting and tried to apply the role with only nginx_config_main_template_enable set to true but it fails as well.

Using the role with nginx_config_main_template_enable set to true fails with default role values.

To reproduce

Steps to reproduce the behavior:

1. Deploy NGINX Config role using playbook.yml

- name: NGINX
  hosts: nginx
  debugger: on_failed
  become: true

  pre_tasks:
  - name: Enabling nginx_config_main_template
    set_fact:
      nginx_config_main_template_enable: true
  roles:
  - role: nginxinc.nginx
  - role: nginxinc.nginx-config

1. Output error is (with -vvv option for verbosity)

TASK [nginxinc.nginx-config : Dynamically generate NGINX main configuration file] ***********************************************************************************************************
task path: /home/xxx/ansible/yyy/roles/nginxinc.nginx-config/tasks/config/template-config.yml:37
fatal: [nginx_0]: FAILED! => {
    "changed": false,
    "msg": "AnsibleUndefinedVariable: 'dict object' has no attribute 'dest'"
}

I don't have any more info on which 'dict object' it fails on, as the task Dynamically generate NGINX main configuration file has fallback default values for the dest file (/etc/nginx/nginx.conf) and thus shouldn't fail.

Expected behavior

Comments say "# Defaults are the values found in a fresh NGINX installation." so it should create a standard nginx.conf file with default values.

Your environment:

• main
• Version of Ansible: ansible 2.9.17
• Version of Jinja2: 2.11.2
• Target deployment platform: Debian Buster