def make_list(thing_that_should_be_a_list):
    """If it is not a list.  Make it one. Return a list."""
    if thing_that_should_be_a_list is None:
        thing_that_should_be_a_list = []
    if not isinstance(thing_that_should_be_a_list, list):
        thing_that_should_be_a_list = [thing_that_should_be_a_list]
    return thing_that_should_be_a_list
