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src/Sdk/DTObjectTemplating/ObjectTemplating/Tokens/NullToken.cs

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+using System;
+using System.ComponentModel;
+using System.Runtime.Serialization;
+using GitHub.DistributedTask.Expressions2.Sdk;
+using GitHub.Services.WebApi.Internal;
+
+namespace GitHub.DistributedTask.ObjectTemplating.Tokens
+{
+    [DataContract]
+    [ClientIgnore]
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    public sealed class NullToken : LiteralToken, INull
+    {
+        public NullToken(
+            Int32? fileId,
+            Int32? line,
+            Int32? column)
+            : base(TokenType.Null, fileId, line, column)
+        {
+        }
+
+        public override TemplateToken Clone(Boolean omitSource)
+        {
+           return omitSource ? new NullToken(null, null, null) : new NullToken(FileId, Line, Column);
+        }
+
+        public override String ToString()
+        {
+           return String.Empty;
+        }
+    }
+}