Set domain_with_ds to "" if no parent domain

domain_with_ds is checked against the empty string when checking whether
we should define ds_subname.

When no parent_domain was found, we setting domain_with_ds to None,
which in Ansible 10 was (correctly) failing the domain_with_ds != ""
check. However, in Ansible 12, it now fails that check, meaning that
Ansible tried to evaluate ds_subname even when domain_with_ds was None,
resulting in a type conversion failure.

Therefore, make sure that domain_with_ds is always a string, even if
parent_domain is undefined, and use the empty string to represent this,
as expected in the playbook itself.

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