title: Return string if data is empty, nil or blank?
body: <p>I have a <code>text_area</code> that I want to set the <code>placeholder</code> attribute for if a particular object is empty, nil or blank.</p>
  
  <p>I'm currently doing this:</p>
  
  <pre><code>&lt;%= f.text_area :comment, placeholder: @response.followup ||= "Would you like to add a note?" %&gt;
  </code></pre>
  
  <p>And that seems to work if <code>@response.followup</code> is <code>nil</code>, but if it's just empty...it doesn't use the <code>"Would you like to add a note?"</code> default text I'm setting.</p>