Error related to automated cleanups of Galaxy created files - Hands-on: Configuring PostgreSQL Backups

At this step https://training.galaxyproject.org/training-material/topics/admin/tutorials/backup-cleanup/tutorial.html#user-created-files after having installed gxadmin ( version: 0.0.12) with Ansible and made the changes to galaxy.yml and group_vars/galaxyservers.yml for Galaxy Created Files , I get this error when I run the playbook:

fatal: [galaxy.vm.fedcloud.eu]: FAILED! => 
  msg: |-
    An unhandled exception occurred while templating '{{ (galaxy_tmpclean_log is not true) | ternary(
        ((galaxy_tmpclean_log is none) | ternary(
            '>/dev/null',
            '>>' ~ galaxy_tmpclean_log
        )),
        ''
    ) }}'. Error was a <class 'ansible.errors.AnsibleError'>, original message: template error while templating string: no test named 'true'. String: {{ (galaxy_tmpclean_log is not true) | ternary(
        ((galaxy_tmpclean_log is none) | ternary(
            '>/dev/null',
            '>>' ~ galaxy_tmpclean_log
        )),
        ''
    ) }}

Start with the Hands-on: Configuring PostgreSQL Backups tutorial at the linked user-created-files step, then inspect the gxadmin 0.0.12 configuration in galaxy.yml and group_vars/galaxyservers.yml. Reproduce the playbook run and trace the galaxy_tmpclean_log template error; done means the cleanup configuration runs without the Ansible "no test named 'true'" failure.