Update app.py

app.py

@@ -612,7 +612,11 @@ def infer_upscale(
         print(f"Error in infer_upscale: {str(e)}")
         return None, seed
 
-
+def check_upscale_input(input_image, *args):
+    if input_image is None:
+        raise gr.Error("Please provide an input image for upscaling.")
+    return input_image, *args
+    
 with gr.Blocks(theme="Nymbo/Nymbo_Theme", css=css, delete_cache=(60, 3600)) as app:
     loras_state = gr.State(loras)
     selected_indices = gr.State([])