Henrix
Explorer
Hypersmurf said:+2 when applied to 0 is 2.
+2 when applied to nothing is nonsensical - you can't add something unless there's something to add it to (even if that something is 0).
That is, frankly, nonsense

If you have nothing, and somebody gives you two apples, you have two apples.
Differentiating between spells that heal 0 hp and spells that heal {} hp seems ridiculous.