This doesn't apply anymore, since property values are written back to State upon widget initialization. Properties that are defined for a kind always have a value. And trying to get the value of a property that is not defined for a kind throws an exception.
This doesn't apply anymore, since property values are written back to State upon widget initialization. Properties that are defined for a kind always have a value. And trying to get the value of a property that is not defined for a kind throws an exception.