An empty position means that the loss is greater than the deposit in your account. After the company is forced to draw a tie, the remaining funds are the total funds MINUS your losses, and generally there will be a part left.

Closing position refers to the behavior of futures traders to buy or sell futures contracts with the same variety, quantity and delivery month, but in the opposite direction, and to close their positions. Simply put, it means "sell what you bought and buy what you sold (short)."