Make sure subclassed Site objects are considered.
Make sure subclassed Site objects are considered.

silverstripe-australia/silverstripe-multisites,Zauberfisch/silverstripe-multisites,xini/silverstripe-multisites,Zauberfisch/silverstripe-multisites,stephenmcm/silverstripe-multisites,xini/silverstripe-multisites,silverstripe-australia/silverstripe-multisites,stephenmcm/silverstripe-multisites