title: Rails scope for IS NOT NULL and is not empty/blank?
body: <p>I have the following scope:</p>
  
  <pre><code>scope :comments, :conditions =&gt; ['text_value IS NOT NULL']
  </code></pre>
  
  <p>But I also want the conditions to say "OR text_value IS NOT EMPTY" (or something to that effect).</p>
  
  <p>I don't want to select any rows where <code>text_value</code> is empty/blank.</p>