Owner of pool cannot unbond when requirements are met

[Juanma0x]

After the nomination pool's state is set to "destroying" and all members have been removed, the owners of nomination pools cannot unbond an amount that would leave the pool below nominationPools.minCreateBond, using the Staking Dashboard.

However, pool owners can still unbond the full amount using the extrinsic nominationPools.unbond. Therefore, the limitation is due to the functionality of the Staking Dashboard.

Ideally, the Staking Dashboard should allow pool owners to unbond the entirety of their funds in the pool when the pool is set to "destroying" and there are no remaining members.