docs: @Nonnull
    public static HCConditionalCommentNode getAsConditionalCommentNode (@Nonnull @Nonempty final String sCondition,
                                                                        @Nonnull final IHCNode aNode)
    {
      if (aNode instanceof HCConditionalCommentNode)
        return (HCConditionalCommentNode) aNode;
      return new HCConditionalCommentNode (sCondition, aNode);
    }