missed one union

cdplib/hyperopt/HyperoptPipelineSelector.py

@@ -362,8 +362,8 @@ class HyperoptPipelineSelector(PipelineSelector):
 
             self._logger.log_and_raise_error(err)
 
-    def get_n_best_trial(self, n: int)\
-            -> Union[List[Pipeline], None]:
+    def get_n_best_trial(self, n: int):#\
+            # -> Union[List[Pipeline], None]:
         """
         :return: the list of n best trails
         """