No, no there hasn't. Nintendo didn't have any kind of "patching" or "update" service for a majority of the Wii's lifespan, in fact there isn't any official "patching" service on the Wii at all, it was only somewhat-recently (as in, April/November 2012) added to the 3DS and the Wii U.
Official? maybe not but there were a couple of game patches/updates on the Wii and 3DS. Mario Kart & Skyward Sword being the 2 that come to mind.
People really hate Nintendo on GBAtemp, lol