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`secret unlocker list --json` printed "unlockers": null for a vault with no unlockers, and `secret vault list --json` printed "vaults": null when vaults.d held no vaults. Both lists were nil slices, which encoding/json writes as null. Each is now made as an empty slice before it is filled, so an empty list prints as []. vault.ListVaults therefore returns an empty slice instead of nil for an empty vaults.d; its other callers only range over the result or check its length. Model: opus-5-5