title: Not add all components when displaying an error in WICKET
body: <p>I have a page that takes a single argument.  If this argument is NOT passed, then I would like to display an error message ("please pass argument 'blah") which will be shown in a FeedBackPanel and bail out.  However, if I do not attach all the components, then wicket has an error instead, redirecting the client to Wicket's error page.</p>
  
  <p>Is there any way to display an error messages and NOT add all the items to a page?  Some of the items are ListViews, etc...</p>