add model exists status check to modeuls/api/api.py , /sdapi/v1/options [POST]

from modules.textual_inversion.preprocess import preprocess

from modules.hypernetworks.hypernetwork import create_hypernetwork, train_hypernetwork

from PIL import PngImagePlugin,Image

from modules.sd_models import checkpoints_list, unload_model_weights, reload_model_weights

from modules.sd_models import checkpoints_list, unload_model_weights, reload_model_weights,checkpoint_alisases

from modules.sd_models_config import find_checkpoint_config_near_filename

from modules.realesrgan_model import get_realesrgan_models

from modules import devices

    def set_config(self, req: Dict[str, Any]):

        for k, v in req.items():

            if k == "sd_model_checkpoint":

                checkpoint_info = checkpoint_alisases.get(v, None)

                if checkpoint_info is None:

                    print(f"model [{v}] not founded, skip config saving process")

                    return 

            shared.opts.set(k, v)

        shared.opts.save(shared.config_filename)