// Get the prior revision (the same for null edits)
if ( $newRev->getParentId() ) {
$oldRev = Revision::newFromId( $newRev->getParentId(), Revision::READ_LATEST );
// Get the prior revision (the same for null edits)
if ( $newRev->getParentId() ) {
$oldRev = Revision::newFromId( $newRev->getParentId(), Revision::READ_LATEST );