What is the hash of a null-type attribute value?

[Tom Zeller]

> The hashes are used to detect changes to the values

Rod,

Looks like you changed the hashes of empty attribute values, are we
sure we want to do that ?

If a deployer of consent is comparing attribute values
(idp.consent.compareValues=true), then users with empty attribute
values will be prompted for consent (because the hash of an empty
attribute value has changed).

Thanks for catching this.

Tom