## Controlled Python Script "validate_edit_marker"
##bind container=container
##bind context=context
##bind namespace=
##bind script=script
##bind state=state
##bind subpath=traverse_subpath
##parameters=add=None, remove=None
##title=Validate changing marker interfaces
##

if add is None and remove is None:
    state.setError('error', 'Must choose at least an interface for adding or removing.', 'input_required')

if state.getErrors():
    return state.set(status='failure', portal_status_message='Please correct the indicated errors.')
else:
    return state