System.Linq.Expressions.Expression.Empty C# (CSharp) Method

        public static DefaultExpression Empty()
        {
            return new DefaultExpression(typeof(void)); // Create new object each time for different identity
        }

        public Expr CompileIfStatement(ParseTreeNode parseNode)
        {
            //[0] - Condition
            //[1] - True Block
            //[2] - {ElseIf Statements}
            //[3] - [Else Block]

            bool hasElseIfs = parseNode.ChildNodes[2].ChildNodes.Any();
            bool hasElse    = parseNode.ChildNodes[3].ChildNodes.Any();

            Expr ifStatement = Expr.Empty();

            //Add else component
            if (hasElse)
            {
                ifStatement = CompileBlock(parseNode.ChildNodes[3]);
            }

            foreach (var elseIf in Enumerable.Reverse(parseNode.ChildNodes[2].ChildNodes))
            {
                ifStatement = Expr.IfThenElse(
                    TypeHelpers.ToBoolean(CompileExpression(elseIf.ChildNodes[0])),
                    CompileBlock(elseIf.ChildNodes[1]),
                    ifStatement);
            }

            ifStatement = Expr.IfThenElse(
                TypeHelpers.ToBoolean(CompileExpression(parseNode.ChildNodes[0])),
                CompileBlock(parseNode.ChildNodes[1]),
                ifStatement
                );

            return(ifStatement);
        }