'Given a destination ID or tag, return all JobDestinations matching the provided ID or tag
:param id_or_tag: A destination ID or tag.
:type id_or_tag: str
:returns: list or tuple of JobDestinations
Destinations are not deepcopied, so they should not be passed to
anything which might modify them.'

def get_destinations(self, id_or_tag):

    return self.destinations.get(id_or_tag, None)
