No MessageID and MessageContent in ReadPublicationResponse for non-Json content

[mattys101]

Hello,
I think I found a little bug with the publication and read of the messages when non-Json content is provided for the message content while trying to do a simple test by just sending a string (which is still technically JSON). For example,

producer.PostPublication(ServerUrl, SessionID, Topic, "\"A test message\"");

Basically, if non-Json content is used it is not written nor read properly.
I assume this is based on the assumption that the content should be a JSON Object and/or the way the JSON library in use handles non-Json content.

Suggested short term fix would be to raise an exception if a non-Json Object is provided or being read, just so that it is clear to the user of the library that it is expected to be a JSON Object.
Long term fix of course would be to support the different content types.