Nuxeo Automation Java Client should not crash if target marshalled class is not available

When Automation Java Client reads the JSON sent by the server it will try to map it to a java class : if the class is not present, it will crash.

The problem is that we allow to register marshallers via Extension point on the server side. The target class can not be availble on the client side, and from a developper perspective I really prefer recieving the JSON than a ClassNotFoundError.