[messages] [Module Design] Value for Undefined properties

[Flaney]

When a piece is clicked, its property _Selected _= true. If the piece is
moved using a _SendToLocation_ trait, the property _Selected _= ???.
It's not false; How does one test these kinds of properties? _Selected
_= null? 

What does Vassal do here?

    _OldLocationName_
    _OldBoard_
    _OldZone_
    _OldX_
    _OldY_

Thanks,
Flaney

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