Corrected an issue around the adding a new site tree element, where the parent ID wasn't correctly carried through.
Corrected an issue around the adding a new site tree element, where the parent ID wasn't correctly carried through.

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