technically speaking, ADDT and the Spry framework have about nothing in common, and you´re going to stumble across many compatibility-related issues when trying to use them together.
Does anyone have a solution??
any regular user who´d like to provide a solution to this, would have to be a pretty skilled programmer and would have to know the "technical details" of both ADDT and SPRY very well to be of help -- I don´t think that you´ll find many folks here who are capable to do that.
However, why not making the date field required in ADDT ?
Adobe Community Expert, Dreamweaver