refactor: return None from pickle_dump();

pypots/data/saving/pickle.py

@@ -6,13 +6,12 @@
 # License: BSD-3-Clause
 
 import pickle
-from typing import Optional
 
 from ...utils.file import extract_parent_dir, create_dir_if_not_exist
 from ...utils.logging import logger
 
 
-def pickle_dump(data: object, path: str) -> Optional[str]:
+def pickle_dump(data: object, path: str) -> None:
  """Pickle the given object.
 
  Parameters
@@ -39,7 +38,6 @@ def pickle_dump(data: object, path: str) -> Optional[str]:
  )
  return None
  logger.info(f"Successfully saved to {path}")
- return path
 
 
 def pickle_load(path: str) -> object: