message: Revise the error message
diff: @@ -134,7 +134,7 @@ class FilterByLastComponentDatasetOp : public UnaryDatasetOpKernel {
  if (last_component.NumElements() != 1 ||
  last_component.dtype() != DT_BOOL) {
  return errors::InvalidArgument(
  - "Last component must be a bool tensor with only one element.");
  + "Last component must be a bool scalar.");
  }
  matched = last_component.scalar<bool>()();
  out_tensors->pop_back();
  