Update app.py

app.py

@@ -39,9 +39,9 @@ MAX_IMAGE_SIZE = 1216
 
     
 @spaces.GPU
-def infer(use_image, image: PIL.Image.Image, prompt, negative_prompt, seed, randomize_seed, width, height, guidance_scale, num_inference_steps) -> PIL.Image.Image:
+def infer(use_image, image: PIL.Image.Image=None, prompt, negative_prompt, seed, randomize_seed, width, height, guidance_scale, num_inference_steps) -> PIL.Image.Image:
     # Check if the input image is a valid PIL Image and is not empty
-    if use_image :
+    if use_image and image is not None :
         width, height = image['composite'].size
         ratio = np.sqrt(1024. * 1024. / (width * height))
         new_width, new_height = int(width * ratio), int(height * ratio)