@classmethod
def __new__(cls, *args, **kwargs):
    """Validate the Meta class."""
    cls._meta = getattr(cls, 'Meta', type('Meta', (), {}))
    if 'class_list' not in cls._meta.__dict__:
        cls._meta.class_list = []
    if 'attrs' not in cls._meta.__dict__:
        cls._meta.attrs = {}
    if 'brand' not in cls._meta.__dict__:
        cls._meta.brand = None
    if 'navgroups' not in cls._meta.__dict__:
        cls._meta.navgroups = []
    return super().__new__(cls)
