I just looked it up online and in a dictionary. Three answers came out:
1 满瓶不响，半瓶响叮当--not direct, but similar.
2 空桶响叮当 --a direct and vivid translation for it.
3 无知的人叫得最欢 --reveals more mockery
All are authentic in Mandarin.
Personally, I prefer the third one, for it is amusing and easy to understand. But to be honest, I myself rarely use this proverb.