corrosive seed can only appear on non-walls

git-svn-id: http://svn.net-core.org/repos/t-engine4@6555 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/data/talents/gifts/corrosive-blades.lua

@@ -128,10 +128,13 @@ newTalent{
 
 		local tg = {type="ball", radius=self:getTalentRadius(t), range=self:getTalentRange(t)}
 		local grids = {}
-		self:project(tg, x, y, function(px, py) grids[#grids+1] = {x=px, y=py} end)
+		self:project(tg, x, y, function(px, py) 
+			if not game.level.map:checkEntity(px, py, Map.TERRAIN, "block_move") then grids[#grids+1] = {x=px, y=py} end
+		end)
 
 		for i = 1, t.getNb(self, t) do
 			local spot = rng.tableRemove(grids)
+			if not spot then break end
 			local t = basetrap(self, t, spot.x, spot.y, 6, {
 				type = "seed", name = "corrosive seed", color=colors.VIOLET, image = "trap/corrosive_seeds.png",
 				disarm_power = self:combatMindpower(),