title: JAXB empty element unmarshalling
body: <p>The problem is in the following :</p>
  
  <p>I get the soap response with empty element inside (e.g. <code>... &lt;someDate /&gt; ...</code> )
  and as a result exception is being throwed when JAXB wants to parse this element 
  instead to set the appropriate field with <code>null</code> value.</p>
  
  <p>How to configure JAXB to treat empty elements as null ?
  Can we do this with JAXB only (not using some third-party workarounds)</p>