code: def validate(self, name: str, obj):
      if obj is not None:
          self.checker.validate(name, obj)
  
imports: from typing import Union, Dict, Pattern, Callable, Any, List, Optional
  import re
  import logging
label_desc: Use image node_id 2 for calling the NullableValidator obj's underlying member method code with example usage: obj.validate(name, obj) without return types