also make None a valid option for options API for #11854

import inspect

import types

from pydantic import BaseModel, Field, create_model

from typing import Any, Optional

from typing_extensions import Literal

fields = {}

for key, metadata in opts.data_labels.items():

    value = opts.data.get(key)

    if key == 'sd_model_checkpoint':

        value = None

    optType = opts.typemap.get(type(metadata.default), type(value))

    if (metadata is not None):

        fields.update({key: (Optional[optType], Field(

            default=metadata.default ,description=metadata.label))})

    if optType == types.NoneType:

        pass

    elif metadata is not None:

        fields.update({key: (Optional[optType], Field(default=metadata.default, description=metadata.label))})

    else:

        fields.update({key: (Optional[optType], Field())})