[Bug Report] Optional attributes are always null

[aka-momo]

Current Behavior

Output

#<TestOrganizer::Context bar="world">
nil
"world"

Expected Behavior

Output

#<TestOrganizer::Context bar="world" foo="hello">
"hello"
"world"

Steps to Reproduce

require 'active_interactor'

class TestInteractor < ActiveInteractor::Base
  def perform
    context.foo = "hello"
    context.bar = 'world'
  end
end

class TestInteractor::Context < ActiveInteractor::Context::Base
  attribute :foo
  attribute :baz, default: -> { '!' }
end

class TestOrganizer < ActiveInteractor::Organizer::Base
  organize :test_interactor
end

p context = TestOrganizer.perform
p context.foo
p context.bar

Additional Comments

Sometimes we define optional attributes to Organizers, these attributes might be set by a nested interactor. The attached example shows that foo was not set to 'hello' because it was not set in the TestOrganizer.perform call.

I thought that is was related to #236 but it does not seem to fix the issue.