typo fix

logmetric.py

@@ -148,7 +148,8 @@ class LogMetric(evaluate.Metric):
     # Get differenct scores regarding the content of a log-message
     def getLineContentScore(self, pred_logMessages, ref_logMessages):
         if pred_logMessages == [] and ref_logMessages == []:
-            pred_logMessages, ref_logMessages = [""]
+            pred_logMessages = [""]
+            ref_logMessages = [""]
         sacrebleu_score = self.sacrebleu_metric.compute(predictions=pred_logMessages, references=ref_logMessages)["score"] / 100.0
         
         smape_length_score = self.get_length_score(pred_logMessages, ref_logMessages)