Fix ID not found

[laerciosb]

Hi, thanks for sharing this amazing gem. I updated to version 0.18.1 and I ran into a problem when trying to create openapi from an endpoint in which a non-existent ID is passed as a parameter. Something like:

context 'when resource not found' do
  let(:resource_id) { 'abc123' }

  before do
    get resource_url(resource_id), as: :json
  end

  it { is_expected.to have_http_status(:not_found) }
end

Locally I managed to correct the behavior through this code. In the 0.17.0 version everything was working perfectly fine. I hope this helps in some way and that it continues to evolve. Thank you very much.