The nil-actor guard used a one-armed if and continued into the export path regardless. The CheckPagePermission plug already halts unauthenticated requests before this controller runs, so the corrected early return preserves observable behavior while removing the dead fall-through. The export action is split into per-payload clauses so the guard reads as a flat early return.
Use Ash related-field sort (membership_fee_type.name) instead of
membership_fee_type_id so column order is alphabetical. Load
membership_fee_type when sorting by it even if column is hidden.
In-memory re-sort (Build) uses loaded fee type name.
