code: private Throwable getPropogatedError() {
  		Request req = getRequest();
  
  		if (req != null) {
  			return (Throwable) req.getAttribute(ACTION_ERROR_KEY);
  		}
  
  		return null;
  	}
docs: Retrieves an error which has been propogated from the action to the render phase.
  
  @return the propogated escape, or null if there isn't one.