handling unlink message sending in client when there is no connection

[dorotaphanSiili]

This is relevant for all implementations we have:
c++, python, qt ....
if we get unlink message for a node we should proceed with cleaning on client side and not inform the server - it is already gone there and we don't want to reconnect
this also means that all the message queued for this object ( collected during the disconnected state before unlink is requested) will be sent but not handled