fix: add None check for image input to avoid AttributeError

app.py

@@ -42,6 +42,8 @@ load_model()
 def predict(image):
     if model is None:
         return "⚠️ Model could not be loaded.", {}
+    if image is None:
+        return "⚠️ Please upload an image first.", {}
 
     image = image.convert("L").resize((48, 48))
     arr = np.array(image, dtype=np.float32) / 255.0