Ansible: good syntax to manage or remove file in function of a variable

ansible-manage-or-remove-file.md

Is there a ad hoc idiomatic syntax to do that in Ansible, ie manage the content of a file if a variable is defined or remove the file if the same variable is not defined?

Or maybe this is the good way to do that?

- name: manage the content of /tmp/foo.txt
  template:
    src: foo.txt.j2
    dest: /tmp/foo.txt
    owner: root
    group: root
    mode: '0644'
  when: foo_var is not none

- name: ensure the file /tmp/foo.txt is absent
  file:
    state: absent
    path: /tmp/foo.txt
  when: foo_var is none

- name: manage the content of /tmp/foo.txt
  template:
    src: foo.txt.j2
    dest: /tmp/foo.txt
    owner: root
    group: root
    mode: '0644'
  when: foo_var

- name: ensure the file /tmp/foo.txt is absent
  file:
    state: absent
    path: /tmp/foo.txt
  when: not foo_var