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
You should be able to set up an online wallet in 2 minutes and check it.
For example, you can use litevault.net
If I was doing right with python and wallet.dat file then there is about 100 private keys in some of results that I got, but I think I didnt

And from several scrpits I got different private keys (that is how I know that I dont know exactly what I am doing, just using scripts that I dont understand)
thanks Josepht