I have the same thing on mine. I have been watching it for over a year now and it hasnt gotten any worse. I keep an eye on it and if it starts getting bigger, I'll replace the belt then.
I too have a partial hole in the middle of my belt. It's been 15,000 miles or so since I noticed it. It may have been there for several years now, I really don't know. I don't ride it hard though. I do check it when I wash the bike. Since we have the same bike, maybe you'll get lucky too....