Spell problem

[Hrsha]

Hi otlanders

i need help in this spell

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_PHYSICALDAMAGE)
setCombatParam(combat, COMBAT_PARAM_BLOCKARMOR, true)
setCombatParam(combat, COMBAT_PARAM_DISTANCEEFFECT, CONST_ANI_ETHEREALSPEAR)
 
function onGetFormulaValues(cid, level, skill)
	return -(((skill + 30) / 3) + (level / 4)), -((skill + 30) + (level / 4)), 0
end
 
setCombatCallback(combat, CALLBACK_PARAM_SKILLVALUE, "onGetFormulaValues")
 
local function isWalkable(pos, creature, proj, pz)-- by Nord
	if getTileThingByPos({x = pos.x, y = pos.y, z = pos.z, stackpos = 0}).itemid == 0 then return false end
	if getTopCreature(pos).uid > 0 and creature then return false end
	if getTileInfo(pos).protection and pz then return false, true end
	local n = not proj and 3 or 2
	for i = 0, 255 do
		pos.stackpos = i
		local tile = getTileThingByPos(pos)
		if tile.itemid ~= 0 and not isCreature(tile.uid) then
			if hasProperty(tile.uid, n) or hasProperty(tile.uid, 7) then
				return false
			end
		end
	end
	return true
end
 
 
local function push(id, dir, t)
	if t < 0 or not(isCreature(id)) then return true end
	local pos = getPositionByDirection(getThingPos(id), dir)
	if not(isWalkable(pos, true, false, true)) then
		return true
	end
	doTeleportThing(id, pos, false)
	doSendMagicEffect(pos, CONST_ME_STONES)
	doSendMagicEffect(pos, CONST_ME_POFF)
	addEvent(push, 200, id, dir, t-1)
end
 
local config = {
	ammu = {2543, 2544},
	pushBack = 2	
}
function onCastSpell(cid, var)
	local removed = false
	for _, itemid in pairs(config.ammu) do
		if getPlayerItemCount(cid, itemid) >= 1 then
			doPlayerRemoveItem(cid, itemid, 1)
			removed = true
			break
		end
	end
	if not(removed) then return doPlayerSendCancel(cid, "You need ammunation for this spell.") and false end	
	local ret = doCombat(cid, combat, var)
	if ret then
		local dirTo = getDirectionTo(getThingPos(cid), getThingPos(variantToNumber(var)))
		push(variantToNumber(var), dirTo, config.pushBack)
	end
	return ret
end

it was working good but idno what happened

i want to refuse the spell if no ammo on slot

but the spell casting anytime
(with ammo without ammo with weapon without weapon)
is there any good thing to make it ?

..