fix: dont request cms rewards if we have no reward ids

fixes a cache issue since we have no keys to cache on

apps/scandic-web/server/routers/contentstack/reward/utils.ts

@@ -156,6 +156,10 @@ export async function getCachedAllTierRewards(token: string) {
 }
 
 export async function getCmsRewards(lang: Lang, rewardIds: string[]) {
+  if (!rewardIds.length) {
+    return null
+  }
+
   const tags = rewardIds.map((id) =>
     generateLoyaltyConfigTag(lang, "reward", id)
   )