Format does not allow a null Address value when using a Timestamped<HarpMessage> overload

[bruno-f-cruz]

The Format operator effectively implements the ability of modifying specific parts of an harp message. For instance, all messages coming from a device, can be modified to always have an address = 20 by:

One can use the same concept to "inject" timestamps into other harp messages. For instance:

However, when one tries to combine the two approaches (which could be potentially very useful to generate harp virtual devices), by setting the "address" property to null, the following error is thrown:

No message address is specified