1. A bad GIOP magic is received on the connection.
2. We send a message error and close the connection.
3. Closing the connection causes IIOPConnection.purge_calls to execute.
4. This wakes up an requests waiting for responses with the
        COMM_FAILURE/CONN_ABORT exception.
5. A request thread waiting inside IIOPOutputStream.invoke at
   IIOPConnetion.getResponse catches the SystemException.
6. IIOPOutputStream.invoke creates and returns
        new ClientResponseImpl(systemEx).
7. Interceptors then run and call receive_exception.
8. When the interceptor instance attempts to look at received service
   contexts it gets a NPE because a response created via
   new ClientResponseImpl(systemEx) does not contain the iiop.messages.Message
   instance which is expected by the PI implementation.