Fix issue #71 (#72)

Fixed issue where responses that cannot be split fails

Author: kelvinchanwh

continuous_eval/metrics/generation/text/llm_based.py

@@ -73,7 +73,7 @@ def __call__(self, answer: str, retrieved_context: List[str], question: str, **k
                 score_txt, reasoning = response.split("\n", 1)
                 score = float("yes" in score_txt.lower())
             except ValueError:
-                score = float("yes" in score_txt.lower())
+                score = float("yes" in response.lower())
                 reasoning = response
 
         return {