Null Pointer Exception in EvaluationGraph.Node.Clone

[mme1950]

The Next and the Expression property of an EvaluationGraph.Node can be null.

This exception occurs when a BlockRecord is cloned, because now the XDictionary is cloned.

[mme1950]

Hi @DomCR,
I fixed it with this code. Do you think it is OK? Then I open a PR.

			public object Clone()
			{
				Node clone = (Node)MemberwiseClone();

				clone.Next = (Node)Next?.Clone();
				clone.Expression = (EvaluationExpression)Expression?.Clone();

				return clone;
			}

[DomCR]

Hi @mme1950,

Makes sense, please open the PR to fix it.

Thanks!