[PyQt] How to have QML interpret a property as null (instead of undefined)?

[Russell Warren]

Solution found: Returning a freshly instantiated QObject() does the trick.
QML interprets this as a null.  ie:

@pyqtProperty(QVariant, notify = publicPropertyChanged)#'QDateTime')
def my_date(self):
    if self._my_date is None:
        return QObject()  # QML interprets this as null
    return QDateTime(self._my_date) # no PyQt autoconvert for
datetime->QVariant
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