title: Displaying an error message for an error that happens in a getter, not in an action
body: <p>Moin!</p>
  
  <p>I have a situation where I try to display an error message using <code>p:message</code> for an Exception that is raised in a getter. But this results into the message <code>"WARNUNG: There are some unhandled FacesMessages, this means not every FacesMessage had a chance to be rendered."</code>.</p>
  
  <p>I do the following to attach the Message to FacesContext:</p>
  
  <pre><code>FacesContext.getCurrentInstance().addMessage(cliendId, getFacesMessage(severity, msgKey, args));
  </code></pre>
  
  <p>I think the message cannot be rendered, because, creating a message in a getter happens in a phase where it is to late to render it...</p>
  
  <p>Is there a way to create a message in a getter instead of in an action?
  Maybe it is possible to reset the rendering phase?</p>