fix: https://issues.apache.org/activemq/browse/AMQNET-276

Throw an exception for StreamMessage conversion since Stomp can't send or receive them.

diff --git a/src/main/csharp/Util/StompMessageTransformation.cs b/src/main/csharp/Util/StompMessageTransformation.cs
index 426724a..13b36b1 100644
--- a/src/main/csharp/Util/StompMessageTransformation.cs
+++ b/src/main/csharp/Util/StompMessageTransformation.cs
@@ -55,9 +55,7 @@
 
         protected override IStreamMessage DoCreateStreamMessage()
         {
-            StreamMessage message = new StreamMessage();
-            message.Connection = this.connection;
-            return message;
+            throw new NotSupportedException("Stomp Cannot process Stream Messages");
         }
 
         protected override IMapMessage DoCreateMapMessage()