redirection to SSL fails badly when SSL certificate is not set correctly ..

if someone has set up an SSL site and the https base URL works (i.e. returns code 200) but points to a wrong site (can happen with virtual hosting) the user is hosed, i.e. admin section will give an error (since we switch to https on a site that does not know about civicrm (or drupal / joomla))

ideally we should check that the civicrm dashboard returns a valid code, so we know that civicrm can be accessed under https