Default policy is never used
options.policies_files
defaults to Set.new: https://gitlab.com/gitlab-org/gitlab-triage/blob/d7f1bc432da122d701ec676fc2c4bbe22eb008d2/lib/gitlab/triage/options.rb#L22
Thus
[1] pry(main)> Set.new || ['.triage-policies.yml']
=> #<Set: {}>