EmptyVault

The emptyVault feature can be used to once we are done using a vault for a specific collateral and we wish to repay all debts for the collateral and withdraw our collateral balance without any additional capital.

Note: You should use withdraw instead if the vault you wish to close does not have any outstanding debt.

The EmptyVault call does the following:

1. Flash loan some collateral

2. Use an aggregator to swap loaned collateral for PAR

3. Use swapped PAR to repay any outstanding vault debt

4. Withdraw collateral from vault

Note: There will likely be some leftover PAR from repaying the vault debt since we don't know exactly how much PAR we will get from a swap. The vault will still technically exist after calling emptyVault; it will just have zero collateral balance and zero vault debt.