Fail safely if not in secure.http_mods or trusted_mods

chat_mod/init.lua

@@ -14,4 +14,8 @@ function main(http_api)
 end
 
 local http_api = minetest.request_http_api()
-main(http_api)
+if http_api == nil then
+	minetest.log("error", "Chat Mod is not in secure.http_mods or secure.trusted_mods. Exiting.")
+else
+	main(http_api)
+end