title: Selenium Webdriver stuck when find_element method called with a non-existed widget
body: <p>I'm trying to test with selenium webdriver. My version of selenium is 2.33 and the browser is Firefox. The scripting language is python</p>
  
  <p>Now when I call the method <code>find_element_by_xpath(blabla)</code> If the widget does not exist. The program just gets stuck there with no exception shown. It's just stuck. By the way I have tried <code>find_element_by_id</code>, <code>find_element_by_name</code>, <code>find_elements</code> and changed Firefox to 3.5, 14.0, 21.0, 22.0. The problem always shows up.</p>
  
  <p>Anybody ever got this problem?
  I just want an exception not just getting stuck. Help...</p>