Answer:
Do you know what you can hold without ever touching it?
When set loose I fly away. Never so cursed as when I go astray.
I am what remains when nothing is left.What am I?
Voiceless it cries, Wingless flutters, Toothless bites, Mouthless mutters. What is it?
My first half is normally made of stone, my second is crazy, and I taste sweet when complete.
Break me and I am better immediately set and harder to be broken again.