Cataclysm-dda: Explosive ammo doing less than 1 damage teleports back to your feet before exploding

[Lorith]

Describe the bug
Explosive ammo (at least using custom explosion, others untested) will explode on your feet no matter where you shoot if the ammo + gun combo results in 0 direct damage.

To Reproduce
Steps to reproduce the behavior:

1. Drop attached file into jsons.
2. Open debug wish list, search for test, add all three test guns and a few of each test ammo.
3. Give self debug invincibility, attempt firing each combination of gun and ammo into the distance.

Expected behavior
Even if I shoot a pillow at you, if it has explosives in it, it should explode where I shoot it, not magically teleport back to my feet before exploding.

Additional context
File with test items: https://cdn.discordapp.com/attachments/252368751016542218/505710341049679892/test.json

[kevingranade]

"Modding doesnt work the way I want it to", is not a bug.