fix order of operations during none filtering in data preprocessing

Author: sfluegel05

chebai/preprocessing/datasets/base.py

@@ -335,8 +335,9 @@ def _load_data_from_file(self, path: str) -> List[Dict[str, Any]]:
             val
             for val in data
             if val["features"] is not None
-            and self.n_token_limit is None
-            or len(val["features"]) <= self.n_token_limit
+            and (
+                self.n_token_limit is None or len(val["features"]) <= self.n_token_limit
+            )
         ]
 
         return data