This is Debian bug #316726 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=316726 When one searches for a vendor or a bill and finds only one possibility, the software ought to select it, to save the user a mouse click. Users learn to type good search strings into the window and you might as well take advantage of it.
Pushed a change for version 4.3 to do this.