app with exception handling for face landmark

app.py

@@ -219,22 +219,24 @@ with mp_holistic.Holistic(min_detection_confidence=0.5, min_tracking_confidence=
         image, results = mediapipe_detection(frame, holistic)
         print(results)
 
-        if results is not None:
+        if results is not None and results.face_landmarks is not None:
             landmarks = extract_keypoints(results)
-        if landmarks is not None:
-            # Calculate the number of landmarks per frame
-            landmarks_per_frame = len(landmarks) // (N_ROWS * N_DIMS)
-            # Reshape the landmarks to have shape (None, N_ROWS, N_DIMS)
-            landmarks = landmarks.reshape(-1, landmarks_per_frame, N_DIMS)
-            # Initialize PreprocessLayer
-            preprocess_layer = PreprocessLayer()
-            # Call the PreprocessLayer to preprocess the landmarks
-            processed_landmarks, _ = preprocess_layer.call(landmarks)
-            prediction = make_prediction(processed_landmarks)  # Pass the preprocessed landmarks to make_prediction
-            print("Prediction:", prediction)
-            return prediction
+            if landmarks is not None:
+                # Calculate the number of landmarks per frame
+                landmarks_per_frame = len(landmarks) // (N_ROWS * N_DIMS)
+                # Reshape the landmarks to have shape (None, N_ROWS, N_DIMS)
+                landmarks = landmarks.reshape(-1, landmarks_per_frame, N_DIMS)
+                # Initialize PreprocessLayer
+                preprocess_layer = PreprocessLayer()
+                # Call the PreprocessLayer to preprocess the landmarks
+                processed_landmarks, _ = preprocess_layer.call(landmarks)
+                prediction = make_prediction(processed_landmarks)  # Pass the preprocessed landmarks to make_prediction
+                print("Prediction:", prediction)
+                return prediction
+            else:
+                return "Could not detect landmarks or extract keypoints. Make sure your webcam is working properly."
         else:
-            return "Could not detect landmarks. Make sure your webcam is working properly."
+            return "Could not detect face landmarks. Make sure your webcam is working properly."
 
 
     # Define the Gradio interface