Fix tooltip on grids hit by the Darkness spell

git-svn-id: http://svn.net-core.org/repos/t-engine4@1050 51575b47-30f0-44d4-a5cc-537603b46e54

game/engine/Tooltip.lua

@@ -122,11 +122,11 @@ function _M:displayAtMap(tmx, tmy, mx, my)
 		local tt = {}
 		local seen = game.level.map.seens(tmx, tmy)
 		local remember = game.level.map.remembers(tmx, tmy)
-		tt[#tt+1] = seen and game.level.map:checkEntity(tmx, tmy, Map.PROJECTILE, "tooltip", game.level.map.actor_player)
-		tt[#tt+1] = seen and game.level.map:checkEntity(tmx, tmy, Map.ACTOR, "tooltip", game.level.map.actor_player)
-		tt[#tt+1] = seen and game.level.map:checkEntity(tmx, tmy, Map.OBJECT, "tooltip", game.level.map.actor_player)
-		tt[#tt+1] = seen and game.level.map:checkEntity(tmx, tmy, Map.TRAP, "tooltip", game.level.map.actor_player)
-		tt[#tt+1] = remember and game.level.map:checkEntity(tmx, tmy, Map.TERRAIN, "tooltip", game.level.map.actor_player)
+		tt[#tt+1] = seen and game.level.map:checkEntity(tmx, tmy, Map.PROJECTILE, "tooltip", game.level.map.actor_player) or nil
+		tt[#tt+1] = seen and game.level.map:checkEntity(tmx, tmy, Map.ACTOR, "tooltip", game.level.map.actor_player) or nil
+		tt[#tt+1] = seen and game.level.map:checkEntity(tmx, tmy, Map.OBJECT, "tooltip", game.level.map.actor_player) or nil
+		tt[#tt+1] = seen and game.level.map:checkEntity(tmx, tmy, Map.TRAP, "tooltip", game.level.map.actor_player) or nil
+		tt[#tt+1] = remember and game.level.map:checkEntity(tmx, tmy, Map.TERRAIN, "tooltip", game.level.map.actor_player) or nil
 		if #tt > 0 then
 			self:set("%s", table.concat(tt, "\n---\n"))
 			self:display()