title: Coldfusion 8: IsDefined('URL.variable') and is not ""?
body: <p>I'm trying to find out if a url variable exists, and if it doesn't, make sure that it's not empty.</p>
  
  <p>This does not work:</p>
  
  <pre><code>&lt;cfif IsDefined('URL.affiliateId') and is not ""&gt;
      //
  &lt;/cfif&gt;
  </code></pre>