Completely removed the old x,y=$x1,$y1 default in [remove_item],

since when running into this rare exception (if the SLF doesn't
matching anything) it could be hard to figure out what happens.

[remove_item] does nothing in this case now.

data/lua/wml/items.lua

@@ -72,12 +72,6 @@ end
 
 function wml_actions.remove_item(cfg)
 	local locs = wesnoth.get_locations(cfg)
-	if #locs == 0 then
-		local context = wesnoth.current.event_context
-		if context.x1 then
-			locs[1] = { context.x1, context.y1 }
-		end
-	end
 	for i, loc in ipairs(locs) do
 		remove_overlay(loc[1], loc[2], cfg.image)
 	end