exceptions in GnomeUIHandler

[Nat Friedman <nat helixcode com>]

Martijn van Beers writes:
 > 
 > So, to get a better patch approved, do I add more exceptions to the
 > IDL, and should I change both exceptions into one or just keep using
 > the two existing ones?

    Merge them into one exception.  Makes me think we need a unified
set of all-purpose exceptions somewhere.  Feel free to apply when you
have them merged.

nat