Add custom name and try-except

    return '', geninfo, info

def run_modelmerger(primary_model_name, secondary_model_name, interp_method, interp_amount, save_as_half):

def run_modelmerger(primary_model_name, secondary_model_name, interp_method, interp_amount, save_as_half, custom_name):

    # Linear interpolation (https://en.wikipedia.org/wiki/Linear_interpolation)

    def weighted_sum(theta0, theta1, alpha):

        return ((1 - alpha) * theta0) + (alpha * theta1)

                theta_0[key] = theta_0[key].half()

    filename = primary_model_info.model_name + '_' + str(round(interp_amount, 2)) + '-' + secondary_model_info.model_name + '_' + str(round((float(1.0) - interp_amount), 2)) + '-' + interp_method.replace(" ", "_") + '-merged.ckpt'

    filename = filename if custom_name == '' else (custom_name + '.ckpt')

    output_modelname = os.path.join(shared.cmd_opts.ckpt_dir, filename)

    print(f"Saving to {output_modelname}...")

                with gr.Row():

                    primary_model_name = gr.Dropdown(modules.sd_models.checkpoint_tiles(), elem_id="modelmerger_primary_model_name", label="Primary Model Name")

                    secondary_model_name = gr.Dropdown(modules.sd_models.checkpoint_tiles(), elem_id="modelmerger_secondary_model_name", label="Secondary Model Name")

                custom_name = gr.Textbox(label="Custom Name (Optional)")

                interp_amount = gr.Slider(minimum=0.0, maximum=1.0, step=0.05, label='Interpolation Amount', value=0.3)

                interp_method = gr.Radio(choices=["Weighted Sum", "Sigmoid", "Inverse Sigmoid"], value="Weighted Sum", label="Interpolation Method")

                save_as_half = gr.Checkbox(value=False, label="Safe as float16")

            outputs=[result, text_settings],

        )

        def modelmerger(*args):

            try:

                results = run_modelmerger(*args)

            except Exception as e:

                print("Error loading/saving model file:", file=sys.stderr)

                print(traceback.format_exc(), file=sys.stderr)

                modules.sd_models.list_models() #To remove the potentially missing models from the list

                return ["Error loading/saving model file. It doesn't exist or the name contains illegal characters"] + [gr.Dropdown.update(choices=modules.sd_models.checkpoint_tiles()) for _ in range(3)]

            return results

        modelmerger_merge.click(

            fn=run_modelmerger,

            fn=modelmerger,

            inputs=[

                primary_model_name,

                secondary_model_name,

                interp_method,

                interp_amount,

                save_as_half,

                custom_name,

            ],

            outputs=[

                submit_result,