fixed validation
Merge branch 'master' of https://github.com/openeyes/OphNuIntraoperativenursing
Merge branch 'master' of https://github.com/openeyes/OphNuIntraoperativenursing
Merge branch 'master' of https://github.com/openeyes/OphNuIntraoperativenursing

Conflicts:
	models/Element_OphNuIntraoperativenursing_Items.php