Ansible Automation Platform installation failing task "Install nginx.conf" with "errors.AnsibleUndefinedVariable: 'nginx_user_http_config' is undefined"

Issue

• Installer is failing on task Install nginx.conffor Automation Hub with following error :

  TASK [ansible.automation_platform_installer.nginx : Install nginx.conf] ********
  An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ansible.errors.AnsibleUndefinedVariable: 'nginx_user_http_config' is undefined. 'nginx_user_http_config' is undefined
  fatal: [skd1e6a.ba.ssa.gov]: FAILED! => {"changed": false, "msg": "AnsibleUndefinedVariable: 'nginx_user_http_config' is undefined. 'nginx_user_http_config' is undefined"}