hotfix: fix get multi hashmembers (#47)

* hotfix: return slice of nil replies on disable cache

---------

Co-authored-by: Francisco <francisco.francisco@kumparan.com>

Author: zipzap11

keeper.go

@@ -638,8 +638,15 @@ func (k *keeper) GetHashMember(ctx context.Context, identifier string, key strin
 // GetMultiHashMembers return type is *goredis.StringCmd
 // to reduce looping and casting, so the caller is the one that should cast it
 func (k *keeper) GetMultiHashMembers(ctx context.Context, hashMember []HashMember) (replies []interface{}, err error) {
-	if k.disableCaching || len(hashMember) == 0 {
-		return
+	if len(hashMember) == 0 {
+		return nil, nil
+	}
+	if k.disableCaching {
+		var replies []interface{}
+		for range hashMember {
+			replies = append(replies, goredis.NewStringResult("", goredis.Nil))
+		}
+		return replies, nil
 	}
 
 	pipe := k.connPool.Pipeline()