Invalid admin attribute should not cause a metaclass error

[Robert Myers <myer0052@…>]

When a invalid admin attribute is used a metaclass error is raised.

Example:

    class BadAdminOption(models.Model):
        name = models.CharField(maxlength=30)
    
        class Admin:
            nonexistent = 'option'

Expecting Error::

    "admin" attribute, if given, must be set to a models.AdminOptions() instance.

Actual Error::

    Error when calling the metaclass bases
    __init__() got an unexpected keyword argument 'nonexistent'

[Robert Myers <myer0052@…>]

Should be closed as wontfix since the newadmin will not be using AdminOptions() any more.

[Robert Myers <myer0052@…>]

Since this is about to change there is no need to fix this ticket, the newforms-admin branch will correct this error.