EmptyTemplateHandler fix arguments

[ahorek]

fixes #2086

[JonRowe]

It's preferable to have 1 required, 1 optional, just because it matches their API

[JonRowe]

If possible can we get a test for this?

[ahorek]

there're already about 15 tests failing on rails master, so I don't think it's necessary

https://travis-ci.org/rspec/rspec-rails/jobs/499366086

1) GadgetsController GET #edit returns a success response
     Failure/Error: get :edit, params: {id: gadget.to_param}, session: valid_session
     
     ActionView::Template::Error:
       wrong number of arguments (given 2, expected 1)
     # /home/travis/build/rspec/bundle/ruby/2.6.0/bundler/gems/rails-controller-testing-21014e48be12/lib/rails/controller/testing/template_assertions.rb:61:in `process'
     # /home/travis/build/rspec/bundle/ruby/2.6.0/bundler/gems/rails-controller-testing-21014e48be12/lib/rails/controller/testing/integration.rb:13:in `block (2 levels) in <module:Integration>'
     # ./spec/controllers/gadgets_controller_spec.rb:70:in `block (3 levels) in <main>'
     # ------------------
     # --- Caused by: ---
     # ArgumentError:
     #   wrong number of arguments (given 2, expected 1)
     #   /home/travis/build/rspec/bundle/ruby/2.6.0/bundler/gems/rails-controller-testing-21014e48be12/lib/rails/controller/testing/template_assertions.rb:61:in `process'

[JonRowe]

Fair enough

[benoittgt]

Didn't see it. Thanks!

[nijikon]

Can we backport this to 3.x and release a new version? /cc @JonRowe

[JonRowe]

Sorry no, work to release 4.0.0 is under way and it will be released soon, but its too much maintenance work to support Rails 6 in 3.x.