code: private void validateAttributesToCreateANewRendererViewHolder() {
      if (viewType == null) {
        throw new NullContentException(
            "RendererBuilder needs a view type to create a RendererViewHolder");
      }
      if (layoutInflater == null) {
        throw new NullLayoutInflaterException(
            "RendererBuilder needs a LayoutInflater to create a RendererViewHolder");
      }
      if (parent == null) {
        throw new NullParentException(
            "RendererBuilder needs a parent to create a RendererViewHolder");
      }
    }
docs: Throws one RendererException if the viewType, layoutInflater or parent are null.