Necrotic minions will not spawn Will'o'Wisp upon death if their master is already dead

git-svn-id: http://svn.net-core.org/repos/t-engine4@4739 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/data/talents/spells/grave.lua

@@ -68,7 +68,7 @@ newTalent{
 	tactical = { BUFF = 3 },
 	getParams = function(self, t) return util.bound(30 + self:getTalentLevel(t) * 10, 30, 100), 20 + self:combatTalentSpellDamage(t, 25, 300) end,
 	summon = function(self, t, dam, src, killer)
-		if not killer or not killer.faction or self:reactionToward(killer) >= 0 then return end
+		if not killer or not killer.faction or self:reactionToward(killer) >= 0 or self.dead then return end
 		local minion = require("mod.class.NPC").new{
 			name = "will o' the wisp",
 			type = "undead", subtype = "ghost",