code: def visit_list_optional(
      self,
      key: Union[str, Enum],
      consumer: Callable[["FluentList"], Any],
  ) -> "FluentDict":
      if self._is_not_none(key):
          self.visit_list(key, consumer)
      return self
  
imports: from enum import Enum
  from typing import Union, Callable, Any, Dict, Optional, Type, List, Generic, TypeVar
label_desc: Use image node_id 14 for calling the FluentDict obj's underlying member method code with example usage: obj.visit_list_optional(key, consumer) and returns: self