If you have no money in your PayPal account AND do not have a credit card or bank account connected to your PayPal account you"may" be off the hook. If the amount is large enough PayPal could send the amount out for collection.
If you do have a bank account connected they will try to extract the funds from your bank, if there is not enough funds there you will get dinged a service charge by your bank similar to an NSF item (currently $20 - $30 at most banks.
I also suspect that if you try to open a new PayPal account in the future they may be able to make a "connection" and extract the funds from your new account. I'm not sure about this but it seems likely to me.
Ben

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.