title: thymeleaf errors
body: <p>Here is my template sample:</p>
  
  <pre><code>&lt;tr th:with="negNumber = ${myNum &lt; 0}"&gt;
  ...
  &lt;/tr&gt;
  </code></pre>
  
  <p>And I got the following exception message:</p>
  
  <pre><code>Caused by: org.xml.sax.SAXParseException: The value of attribute "th:if" associated with an element type "null" must not contain the '&lt;' character.
  </code></pre>
  
  <p>Any idea?</p>