title: In sqlalchemy, is there a way to sort so that empty cells are at the end irrespective or sort order?
body: <p>I have a pretty standard setup and want to sort by a column:</p>
  
  <p><code>someselect.order_by(asc(table1.mycol))</code></p>
  
  <p>However, I want rows with <code>''</code> or <code>NULL</code> for <code>mycol</code> to appear at the end of the results. Is there a way to do this?</p>