ActiveResource validations throws exceptions if errors missing

If the JSON response lacks the 'errors' element, a nil exception is thrown:

undefined method each' for nil:NilClass /usr/lib/ruby/gems/1.8/gems/activeresource-2.3.5/lib/active_resource/validations.rb:206:infrom_array'

This happens in my case because the resource controller does not render :json => @user.errors. You could say it should, but still I think Rails should be more robust in this case.

Monkeypatch in my project:
module ActiveResource

class Errors
  def from_json(json)
    array = ActiveSupport::JSON.decode(json)['errors'] rescue []
    array ||= []      # THIS IS THE PATCH
    from_array array
  end
end

end

Same applies to XML (probably).