Bug: unexpected property in the request.

[kavics]

An unexpected property appears in the web request when the Client.Net saves brand new content. The code:

var container = repository.CreateContent(rootPath, containerType, containerName);
await container.SaveAsync().ConfigureAwait(false);

The request:

models=[{"Name":"MyMemos","__ContentType":"MemoList","Existing":false}]

Expectation: The request should never include the "Existing" property.

[kavics]

Fixed in another issue.