refac repr of data handler, joined ";" can cause problems when data are used as competitor

mlair/data_handler/data_handler_mixed_sampling.py

@@ -336,6 +336,7 @@ class DataHandlerMixedSamplingWithClimateFirFilter(DataHandlerClimateFirFilter):
         else:
             return super().get_X_original()
 
+
 class DataHandlerSeparationOfScalesSingleStation(DataHandlerMixedSamplingWithKzFilterSingleStation):
     """
     Data handler using mixed sampling for input and target. Inputs are temporal filtered and depending on the

mlair/data_handler/default_data_handler.py

@@ -134,7 +134,7 @@ class DefaultDataHandler(AbstractDataHandler):
         return X, Y
 
     def __repr__(self):
-        return ";".join(list(map(lambda x: str(x), self._collection)))
+        return str(self._collection[0])
 
     def get_X_original(self):
         X = []