don't enter retry loop in case sAddItems is empty

projectbackfeedmanager.go

@@ -162,8 +162,8 @@ func (that *ProjectBackfeedManager) Do() {
 		}
 		dupes := wrapped - len(sAddItems)
 		try = 0
-		for {
-			if len(sAddItems) != 0 {
+		if len(sAddItems) != 0 {
+			for {
 				if err := that.ProjectRedis.SAdd(context.Background(), fmt.Sprintf("%s:todo:backfeed", that.Name), sAddItems...).Err(); err != nil {
 					log.Printf("failed to sadd items for %s: %s", that.Name, err)
 					time.Sleep(time.Duration(try) * time.Second)