I just started my training in the am and I'm in love with it. Gym is empty and I can just bang it out and go. No altering my routine because someone is using the station I wanted next or any of that. As far as training on an empty stomach you don't have to. My pre workout meal/shake right now is 1 scoop whey 1 scoop casein, 1 cup ground oats, and 2 big tbsp of instant coffee. I have this about 30-45 minutes before I hit the gym and have more energy than any preworkout ever gave me.

Someone a few months ago posted an article about carb backloading. It was a really good read. You may wanna check that out to alleviate some worries about training in the am.