Add optional block for Callable#result

[Codcore]

So we can do like (pseudo code):

UserCreate.run(params: user_params) do |u|
  if u
    redirect_to users_path
  else
    render 'users/new'
  end
end

[AaronLasseigne]

You can do this with tap. I'd prefer to save the block for some possible future use.

UserCreate.run(params: user_params).tap do |u|
  if u
    redirect_to users_path
  else
    render 'users/new'
  end
end