Update app.py

app.py

@@ -169,7 +169,10 @@ class MistralRAGChatbot:
         min_score = min(combined_scores.values())
         max_score = max(combined_scores.values())
 
-        normalized_scores = {idx: (score - min_score) / (max_score - min_score) for idx, score in combined_scores.items()}
+        if min_score == max_score:
+            normalized_scores = {idx: 0.5 for idx in combined_scores}
+        else:
+            normalized_scores = {idx: (score - min_score) / (max_score - min_score) for idx, score in combined_scores.items()}
 
         sorted_indices = sorted(combined_scores, key=combined_scores.get, reverse=True)