Version 1.8.0 fail at yaml config generation because of empty var lua_dns_script

[kokel]

Hello,

thanks for this role and the new version.

OS: Ubuntu 24.04
PDNS Recursor Version: 5.0

The role fails at the task Generate the PowerDNS Recursor configuration because the following vars are empty:

pdns_rec_base_config.recursor.lua_config_file
pdns_rec_base_config.recursor.lua_dns_script

We don't use this and thus we don't set the following vars:

pdns_rec_config_lua_file_content
pdns_rec_config_dns_script_file_content

Error message:

TASK [powerdns.pdns_recursor : Generate the PowerDNS Recursor configuration] ********
[ERROR]: Task failed: The filter plugin 'ansible.builtin.to_nice_yaml' failed: ('cannot represent an object', Undefined)

Task failed.
Origin: /ansible/roles/external/powerdns.pdns_recursor/tasks/configure.yml:36:3

34     mode: "0750"
35
36 - name: Generate the PowerDNS Recursor configuration
     ^ column 3

<<< caused by >>>

The filter plugin 'ansible.builtin.to_nice_yaml' failed: ('cannot represent an object', Undefined)
Origin: /ansible/roles/external/powerdns.pdns_recursor/templates/recursor.conf.j2

fatal: [host]: FAILED! => {"changed": false, "msg": "Task failed: The filter plugin 'ansible.builtin.to_nice_yaml' failed: ('cannot represent an object', Undefined)"}

If we set the mentioned vars is it working:

pdns_rec_config_dns_script_file_content: "-- empty"
pdns_rec_config_lua_file_content: "-- empty"