You are not required to submit information that has been expunged from your record. Also, that is not one of the offenses that is disqualifying. Other than those offenses listed that are disqualifying, you don't have to report anything over 10 years ago. Besides, I believe you said you were never convicted.
My disclaimer: I'm not a lawyer. I'm providing this info based on what I read on the forms I filled out going through the interview process. The infomation is to the best of my knowledge and I am about 98% sure of the accuracy. So, if someone knows more about this, please chime in.
Hope this helps some...I think you will be ok.