Somebody just barely started a post about leaving stuff out...but I'll give you my opinion.
Will someone catch you if you leave it out. Probobly not. Unless your current school knows about your community college experience. If you transfered anything from the community college to your current school it will appear on your current school transcript. So even if you don't sent in the transcript from the community college AADSAS will see that you neglected to send it.
But say that you with held that information from your current school and AADSAS...what you are basically doing is lying about your academic record. Why do you not want to include it? If it is a bad grade and you are trying to hide it, I would question how honest you are being with your application. Don't rob from those other applicants that you are competing with that are being totally honest about their academic record. There are some things that I wish I could have done to spruce up my application a little, but in the end I think honesty is the best route.