Placing Torches on the sides of blocks it cant be placed on makes a Floating Torch

What I expected to happen was...:
The Torch would not be place-able at all.

What actually happened was...:
The Torch was placed in the air, but when it had received a block update, it breaks.

Steps to Reproduce:
1. Get any block a Torch cannot be placed on the side of.
2. Get a Block a Torch can be placed on the side of, then put it next to where the torch will end up
3. Attempt to Place it on the side of the Slab

Pictures:

The Floating Torch:
http://puu.sh/aKIi3/6bf197e5d4.png

Same, but produced by an Iron Bar:
http://puu.sh/aKIO4/eb025cbb1a.jpg