Explosions won't damage an entity if the distance to its eyes is 0

How to reproduce:

1. /gamemode survival

2. /summon tnt ~ ~1.55875000357628 ~ {NoGravity:1b}

The reason is that avoids division by 0 by just ignoring zero-distance entities in net.minecraft.world.level.Explosion#explode().

Obviously, it's quite hard to abuse this bug, but hacked clients may make use of it.