I would say you most likely had a clean miss as well. My guess is the deer probably ducked at the sound of your bowstring. Though the shot may have broken perfectly as the deer was standing still, you may not have noticed what the deer did in the fraction of a second the arrow was en route.

I have shot a deer or two that left very little evidence on the arrow, but there was at least "some" blood or hair. Inspect your arrow very closely. Hair often gets trapped under the leading edge of fletchings as well as in the broadhead. Run your hand down a clean arrow, then down the arrow you shot. Take note of any apparent difference in friction between the two shafts or of any bumps or undulations on the one that was shot (ie; small amounts of dried fluids or tissue sticking to it).