(a) The judgment in an action subject to the provisions of this act against a governmental entity shall constitute a complete bar to any action by the claimant, by reason of the same subject matter, against the employee whose act or omission gave rise to the claim.
(b) Any judgment against an employee whose act or omission gave rise to the claim shall constitute a complete bar to any action for injury by the claimant, by reason of the same subject matter, against a governmental entity.