I don't know too much, but isn't it possible to copy the private key, and import it in an online wallet?
Might be a stupid idea, but IMO it could work.
Also, you can check if the wallet really has 0 LTC by checking the address on
https://live.blockcypher.com/ltc/I did check only one private key trough LTC console, it needed 3 hours to check it! And after that I have received message: null