Damage check before de-limbing in explosions.

[Floor_Tile]

I decided to experiment with erebite on the extended server and for safety I decide to wear mining armor. The erebite exploded after smelting (no surprise) taking off both my arms (surprise) despite doing NO DAMAGE (surprise surprise).

TL;DR, explosion does 0 damage but delimbs me while doing 0 damage.

There needs to be a damage check. If the person doesn't take any damage (because of fancy armor), there shouldn't be any de-limbing simply because the person didn't actually take any damage.