nexus_default_role: empty variable causing role to fail

[felipe4334]

By default, nexus_default_role variable is assigned the value of "", this will throw an error:

"javax.script.ScriptException: javax.validation.ConstraintViolationException: Validation failed; 1 constraints violated"

tasks/main.yml:

- name: Configure Default Role capability
  ansible.builtin.include_tasks: call_script.yml
  vars:
    script_name: setup_capability
    call_args:
      capability_typeId: defaultrole
      capability_enabled: "{{ (nexus_default_role | length > 0) }}"
      capability_properties:
        role: "{{ nexus_default_role }}"

This is fixed by setting nexus_default_role: "nx-anonymous", but this should be a default setting in defaults/main.yml or there should be a when: nexus_default_role | length > 0 statement for that task.