I have something like the following HTML that represents multiple choice questions. The pattern is normally <p> tag (the question), followed by and <ol> and four <li>s (the answer choices). However, only occasionaly, a question is more than one <p> tag long.

<ol />
<p class="Question-Stem">Which choice is best?</p>
<ol>
  <li class="Answer-Choice">text</li>
  <li class="Answer-Choice">text</li>
  <li class="Answer-Choice">text</li>
  <li class="Answer-Choice">text</li>
</ol>
<ol />
<p class="Question-Stem">Which choice is best?</p>
<p class="Indented-Sentence">more text</p>
<p class="Question-Stem">more text</p>
<ol>
  <li class="Answer-Choice">text</li>
  <li class="Answer-Choice">text</li>
  <li class="Answer-Choice">text</li>
  <li class="Answer-Choice">text</li>
</ol>
<ol />
<p class="Question-Stem">null</p>
<ol>
  <li class="Answer-Choice">text</li>
  <li class="Answer-Choice">text</li>
  <li class="Answer-Choice">text</li>
  <li class="Answer-Choice">text</li>
</ol>
    

I am parsing the questions into an array of hashes, one hash per question

questions_array = []

questions_doc.css('p.Question-Stem').each do |p|
  # skip this iteration if the previous tag is not an ol tag 
  # (i.e. it's not the beginning of the stem)
  next if p.previous_element.name != "ol"
  question = { :stem => "", :answer_choices => [] }
  p.inner_html == "null" ? question[:stem] = "" : question[:stem] = p.inner_html
  p.next_element.element_children.each do |child|
    question[:answer_choices] << child.inner_html
  end
  questions_array << question
end

This is parsing exactly as I would like except for those few cases where the question stem is three p tags in a row. In those cases, I want the html of all three tags together to get pushed into question[:stem]. Any ideas how to achieve that?
I have already read How to parse consecutive tags with Nokogiri? but didn’t find the solutions applicable to this case.