[MC-259810] /damage can be set to 0 with an incorrect error message

Steps to Reproduce:
1) Run

/damage @s 0

2) Look at the output: "Target is invulnerable to the given damage type"

Linked issues

Players are invulnerable to damage with 0 damage value before /damage exists. This also happens when you throw a snowball to ohter players.

I think change it to Target is invulnerable to the given damage will solve it.