Follow-on to bug 62398, which incorrectly fixed this issue. (My bad.) As per WebIDL spec, missing required arguments should throw a TypeError, not a database exception.
Patch + fixed test case attached.
Created attachment 97978 [details]
Looks good to me.
Comment on attachment 97978 [details]
Clearing flags on attachment: 97978
Committed r89378: <http://trac.webkit.org/changeset/89378>
All reviewed patches have been landed. Closing bug.