Fix crash reported here: https://forum.minetest.net/viewtopic.php?f=6&t=9726

Ekdohibs · Ekdohibs · commit 24a631ee2ae5 · 2014-07-13T11:05:07.000+02:00
diff --git a/builtin/game/forceloading.lua b/builtin/game/forceloading.lua
@@ -53,7 +53,7 @@ local function read_file(filename)
 	local t = f:read("*all")
 	f:close()
 	if t=="" or t==nil then return {} end
-	return core.deserialize(t)
+	return core.deserialize(t) or {}
 end
 
 local function write_file(filename, table)
