Remove Emerge-0 warning that occurs when placing mineshafts

mods/ENTITIES/mcl_minecarts/functions.lua

@@ -221,10 +221,7 @@ local function update_rail_connections(pos, opt)
 
 	local node = minetest.get_node(pos)
 	local nodedef = minetest.registered_nodes[node.name]
-	if not nodedef or not nodedef._mcl_minecarts then
-		minetest.log("warning", "attempting to rail connect to "..node.name)
-		return
-	end
+	if not nodedef or not nodedef._mcl_minecarts then return end
 
 	-- Get the mappings to use
 	local rules = HORIZONTAL_RULES_BY_RAIL_GROUP[nodedef.groups.rail]