title: BigQuery - IFERROR for standardSQL
body: <p>I'm about to migrate queries from Legacy to Standard in BQ.
  In Legacy I used to have <code>x/y</code> returning <code>null</code> if <code>y=0</code>, however, I'm stuck in StandardSQL with the error:</p>
  
  <blockquote>
    <p>Error: division by zero</p>
  </blockquote>
  
  <p>I'd like to apply something like <code>IFERROR(x/y,null)</code></p>
  
  <p>Is it available in StandardSQL?</p>