deleted blank space pointed out by flake8

Author: nabenabe0928

autoPyTorch/datasets/base_dataset.py

@@ -176,7 +176,7 @@ def __getitem__(self, index: int, train: bool = True) -> Tuple[np.ndarray, ...]:
         Returns:
             A transformed single point prediction
         """
-        
+
         X = self.train_tensors[0].iloc[[index]] if hasattr(self.train_tensors[0], 'loc') \
             else self.train_tensors[0][index]