added error handling

app.py

@@ -56,6 +56,9 @@ def predict_image(image, model_choice):
     # Check if a model is selected
     if model_choice not in model_paths:
         return "Error: Please select a valid model.", ""
+     # Check if an image is provided
+    if image is None:
+        return "Error: Please upload an image.", ""
 
     # Load the selected model if it's not already loaded
     if model_choice != current_model: