If you lose or leave your job, the employee is still responsible for the repayments. They may be able to make a new agreement with a new employer and transfer the lease over. Alternatively, they will need to ensure they can continue to pay the lease costs themselves or pay to break the lease.
If you took out loan termination insurance (also called novated lease protection insurance), check the terms. These might allow you to hand the vehicle back or make a claim, in the case of you being made involuntarily redundant. Some will pay the lease for a period of up to 180 days.