The F-117A was never designed to have chaff/flare dispensers, mainly rely on IR and radar suppression. So basically the thought was it didn't need it in the first place. I could be wrong as I too never have been near a -117A, but seems logical from the smoothness of it's exterior.
As for the Yugoslavia shootdown, it was theorized that it was a combination of an SA-3 and the TAMARA radar, which was designed with anti-stealth properties, since a normal radar disgregards non-radar returns, while TAMARA turns those non-returns into a radar contact. I believe it was the Czech Republic made that, and for them to join NATO, they had to not sell them on the open market. More than likely Russia got a hold of one, or however many by whatever means. Supposedly the S-300s marketing adverts is that it can shoot down cruise missiles, so maybe it's skeptical given real world knowledge (or lack of), but that's probably why they can splash F-117s in LOMAC.
And the only way to get the S-300 is to fly below 25m and get within it's 1.5km minimum range ;), or fly real high and dive on top of it.