Added type hint

Author: kmvanbrunt

cmd2/cmd2.py

@@ -2022,8 +2022,7 @@ def onecmd_plus_hooks(self, line: str, *, add_to_history: bool = True,
                 # we need to run the finalization hooks
                 raise EmptyStatement
 
-            # This will be a utils.RedirectionSavedState object for the command
-            redir_saved_state = None
+            redir_saved_state = None  # type: Optional[utils.RedirectionSavedState]
 
             try:
                 # Get sigint protection while we set up redirection