how could i catch the MVC3 exception and not return an blank view?
protected override void OnException(ExceptionContext filterContext)
{
    base.OnException(filterContext);

    var exception = new HttpException(null, filterContext.Exception);
    if (exception.GetHttpCode() == (int)HttpStatusCode.InternalServerError)
    {
        if (WebConstants.systemHandleExceptionList.Contains(filterContext.Exception.GetType()))
        {
            //process the error
            SaveErrorMessage(filterContext.Exception.GetType().Name);

            filterContext.ExceptionHandled = true;
        }
        else
        {
            //record the unhandle message to log
            errorlog.Error("", filterContext.Exception);
        }
    }
}

RouteValueDictionary errorRouteValues = new RouteValueDictionary( new { controller = "Error", action = "Action" } );

filterContext.Result = new ActionRedirectResult( errorRouteValues );
filterContext.Cancel = true;