Make QuestionPresenter#has_labels? more idiomatic
Make QuestionPresenter#has_labels? more idiomatic

* Using `||` instead of `or` is more idiomatic Ruby
* Using `Object#present?` is more idiomatic Rails

The single use of this method in the `_value_question.html.erb` partial could
do with some refactoring, but I'm going to leave that for now.

aledelcueto/smart-answers,stwalsh/smart-answers,alphagov/smart-answers,aledelcueto/smart-answers,stwalsh/smart-answers,aledelcueto/smart-answers,alphagov/smart-answers,alphagov/smart-answers,aledelcueto/smart-answers,stwalsh/smart-answers,stwalsh/smart-answers,alphagov/smart-answers