question about HelixProperty.isValid()

[Dave Peterson <da...@box.com>]

What is the purpose of HelixProperty.isValid()?  Under what circumstances
should it
be called, and how should a false return value be handled?  In the case of
derived
class ExternalView, which I am interested in at the moment, I see it always
returns
true, but should I check it anyway in case it might return false in some
future version
of Helix?

Thanks,
Dave