Don't write duplicate nulls to trace for byte[]

Src/Newtonsoft.Json.Tests/Serialization/TraceWriterTests.cs

@@ -134,6 +134,21 @@ Newtonsoft.Json Error: 0 : Error!
 ]", traceJsonWriter.GetSerializedJsonMessage());
         }
 
+        [Test]
+        public void WriteNullByteArray()
+        {
+            StringWriter sw = new StringWriter();
+            TraceJsonWriter traceJsonWriter = new TraceJsonWriter(new JsonTextWriter(sw));
+            traceJsonWriter.WriteStartArray();
+            traceJsonWriter.WriteValue((byte[])null);
+            traceJsonWriter.WriteEndArray();
+
+            StringAssert.AreEqual(@"Serialized JSON: 
+[
+  null
+]", traceJsonWriter.GetSerializedJsonMessage());
+        }
+
         [Test]
         public void WriteJRaw()
         {

Src/Newtonsoft.Json/Serialization/TraceJsonWriter.cs

@@ -69,7 +69,14 @@ namespace Newtonsoft.Json.Serialization
         {
             _textWriter.WriteValue(value);
             _innerWriter.WriteValue(value);
-            base.WriteValue(value);
+            if (value == null)
+            {
+                base.WriteUndefined();
+            }
+            else
+            {
+                base.WriteValue(value);
+            }
         }
 
         public override void WriteValue(DateTime value)