title: Python PyAutoGUI return "ImageNotFoundException", but "except" doesn't recognise it as an exception
body: <p>With the previous version of pyautogui, when an image wasn't found the return was "None", so I used to handle it with <code>except TypeError:</code>.
  But since the update (version 0.9.41), it isn't working, as it's returning ImageNotFoundException, but it isn't recognised as an exception. When I try to do <code>except ImageNotFoundException:</code> it gives the error:</p>
  
  <blockquote>
    <p>[E0712] Catching an exception which doesn't inherit from Exception: ImageNotFoundException</p>
  </blockquote>
  
  <p>How should this error be handled?</p>