class_docstr: 不进行任何 检查 与 pad 的空 padder 。
  
  :param ele_dtype:
  :param pad_val:
  :param dtype:
code: def __init__(self, ele_dtype=None, pad_val=None, dtype=None):
      super().__init__(pad_val=pad_val, dtype=dtype)
  
label_desc: Use image node_id 1 to create a new NullPadder object from inherited base classes: Padder with example: obj = NullPadder(ele_dtype, pad_val, dtype)