The submission and power given to the arbitrators are put at an end by one of the following causes:
1. By the expiration of the time limited, either by the submission or by law, though the award should not be yet rendered.
2. By the death of one of the parties or arbitrators.
3. By the final award rendered by the arbitrators.
4. When the parties happen to compromise touching the thing in dispute, or when this thing ceases to exist.