class_docstr: SkipIfEmpty operator.
code: def apply(
      self,
      input_dict_list: Sequence[typing_utils.ArtifactMultiMap],
  ) -> Sequence[typing_utils.ArtifactMultiMap]:
      if not input_dict_list:
          raise exceptions.SkipSignal()
      return input_dict_list
  
imports: from typing import Sequence
  from tfx.dsl.input_resolution import resolver_op
  from tfx.orchestration.portable.input_resolution import exceptions
  from tfx.utils import typing_utils
label_desc: Use image node_id 1 for calling the SkipIfEmpty obj's underlying member method code with example usage: obj.apply(input_dict_list) and returns: input_dict_list