(svn r16273) [0.7] -Backport from trunk:

- Fix: Wrong number of parameters or wrong parameter types sent to printf-like functions at several places (r16269)
- Fix: [NewGRF] When callback 2E returns an amount of 0, do not transport 1 unit to the station (r16268)
- Fix: [NoAI] Various documentation omissions with respect to IDs of various objects and corners for AITile::(Raise|Lower)Tile (r16267,r16266)

src/town_cmd.cpp

@@ -455,6 +455,8 @@ static void TileLoop_Town(TileIndex tile)
 			if (cargo == CT_INVALID) continue;
 
 			uint amt = GB(callback, 0, 8);
+			if (amt == 0) continue;
+
 			uint moved = MoveGoodsToStation(tile, 1, 1, cargo, amt);
 
 			const CargoSpec *cs = GetCargo(cargo);