fix #4459 breaking inpainting when the option is not specified.

import traceback

import numpy as np

from PIL import Image, ImageOps, ImageFilter, ImageEnhance

from PIL import Image, ImageOps, ImageFilter, ImageEnhance, ImageChops

from modules import devices, sd_samplers

from modules.processing import Processed, StableDiffusionProcessingImg2Img, process_images

    if is_inpaint:

        # Drawn mask

        if mask_mode == 0:

            image = init_img_with_mask

            is_mask_sketch = isinstance(image, dict)

            is_mask_sketch = isinstance(init_img_with_mask, dict)

            is_mask_paint = not is_mask_sketch

            if is_mask_sketch:

                # Sketch: mask iff. not transparent

                image, mask = image["image"], image["mask"]

                pred = np.array(mask)[..., -1] > 0

                image, mask = init_img_with_mask["image"], init_img_with_mask["mask"]

                alpha_mask = ImageOps.invert(image.split()[-1]).convert('L').point(lambda x: 255 if x > 0 else 0, mode='1')

                mask = ImageChops.lighter(alpha_mask, mask.convert('L')).convert('L')

            else:

                # Color-sketch: mask iff. painted over

                orig = init_img_with_mask_orig or image

                image = init_img_with_mask

                orig = init_img_with_mask_orig or init_img_with_mask

                pred = np.any(np.array(image) != np.array(orig), axis=-1)

                mask = Image.fromarray(pred.astype(np.uint8) * 255, "L")

            if is_mask_paint:

                mask = ImageEnhance.Brightness(mask).enhance(1 - mask_alpha / 100)

                blur = ImageFilter.GaussianBlur(mask_blur)

                image = Image.composite(image.filter(blur), orig, mask.filter(blur))

            image = image.convert("RGB")

        # Uploaded mask

        else:

                        init_img = gr.Image(label="Image for img2img", elem_id="img2img_image", show_label=False, source="upload", interactive=True, type="pil", tool=cmd_opts.gradio_img2img_tool).style(height=480)

                    with gr.TabItem('Inpaint', id='inpaint'):

                        init_img_with_mask_orig = gr.State(None)

                        init_img_with_mask = gr.Image(label="Image for inpainting with mask", show_label=False, elem_id="img2maskimg", source="upload", interactive=True, type="pil", tool=cmd_opts.gradio_inpaint_tool, image_mode="RGBA").style(height=480)

                        init_img_with_mask_orig = gr.State(None)

                        use_color_sketch = cmd_opts.gradio_inpaint_tool == "color-sketch"

                        if use_color_sketch:

                            def update_orig(image, state):

                                if image is not None:

                                    same_size = state is not None and state.size == image.size

                                    return image if not edited or state is None else state

                            init_img_with_mask.change(update_orig, [init_img_with_mask, init_img_with_mask_orig], init_img_with_mask_orig)

                        init_img_inpaint = gr.Image(label="Image for img2img", show_label=False, source="upload", interactive=True, type="pil", visible=False, elem_id="img_inpaint_base")

                        init_mask_inpaint = gr.Image(label="Mask", source="upload", interactive=True, type="pil", visible=False, elem_id="img_inpaint_mask")

                        show_mask_alpha = cmd_opts.gradio_inpaint_tool == "color-sketch"

                        mask_alpha = gr.Slider(label="Mask transparency", interactive=show_mask_alpha, visible=show_mask_alpha)

                        with gr.Row():

                            mask_blur = gr.Slider(label='Mask blur', minimum=0, maximum=64, step=1, value=4)

                            mask_alpha = gr.Slider(label="Mask transparency", interactive=use_color_sketch, visible=use_color_sketch)

                        with gr.Row():

                            mask_mode = gr.Radio(label="Mask mode", show_label=False, choices=["Draw mask", "Upload mask"], type="index", value="Draw mask", elem_id="mask_mode")