Adds test for deserializing XmlElement and a minor change in the exception message

Src/Newtonsoft.Json.Tests/Converters/XmlNodeConverterTest.cs

@@ -906,6 +906,23 @@ namespace Newtonsoft.Json.Tests.Converters
             return sw.ToString();
         }
 
+        public class Foo2
+        {
+            public XmlElement Bar { get; set; }
+        }
+
+        [Test]
+        public void SerializeAndDeserializeXmlElement()
+        {
+            Foo2 foo = new Foo2 { Bar = null };
+            string json = JsonConvert.SerializeObject(foo);
+
+            Assert.AreEqual(@"{""Bar"":null}", json);
+            Foo2 foo2 = JsonConvert.DeserializeObject<Foo2>(json);
+
+            Assert.IsNull(foo2.Bar);
+        }
+
         [Test]
         public void SingleTextNode()
         {

Src/Newtonsoft.Json/Converters/XmlNodeConverter.cs

@@ -1433,7 +1433,7 @@ namespace Newtonsoft.Json.Converters
             {
                 if (objectType != typeof(XmlDocument) && objectType != typeof(XmlElement))
                 {
-                    throw new JsonSerializationException("XmlNodeConverter only supports deserializing XmlDocuments or XmlElement");
+                    throw new JsonSerializationException("XmlNodeConverter only supports deserializing XmlDocument or XmlElement");
                 }
 
                 XmlDocument d = new XmlDocument();