fix(LOY-119): hiding redeemed rewards

some smaller cleanup on coupon property to avoid optional checks

server/routers/contentstack/reward/output.ts

@@ -146,7 +146,7 @@ export const validateCmsRewardsWithRedeemSchema = z
   })
   .transform((data) => data.data.all_reward.items)
 
-export type ApiReward = z.output<typeof validateApiRewardSchema>[0]
+export type ApiReward = z.output<typeof validateApiRewardSchema>[number]
 
 export type SurpriseReward = z.output<typeof SurpriseReward>
 
@@ -207,7 +207,10 @@ const CouponReward = z.object({
   redeemLocation: z.string().optional(),
   operaRewardId: z.string().default(""),
   status: z.string().optional(),
-  coupon: z.array(CouponData).optional(),
+  coupon: z
+    .array(CouponData)
+    .optional()
+    .transform((val) => val || []),
 })
 
 /**
@@ -233,6 +236,10 @@ export const validateCategorizedRewardsSchema = z
     })),
   ])
 
+export type CategorizedApiReward = z.output<
+  typeof validateCategorizedRewardsSchema
+>[number]
+
 export const validateApiAllTiersSchema = z.record(
   z.nativeEnum(TierKey).transform((data) => {
     return TierKey[data as unknown as Key]