Fix queue pop error and stat empty repository error (#10248)

* Fix queue pop error and stat empty repository error

* Fix error

modules/indexer/stats/db.go

@@ -19,6 +19,10 @@ func (db *DBIndexer) Index(id int64) error {
 	if err != nil {
 		return err
 	}
+	if repo.IsEmpty {
+		return nil
+	}
+
 	status, err := repo.GetIndexerStatus(models.RepoIndexerTypeStats)
 	if err != nil {
 		return err

modules/queue/queue_redis.go

@@ -121,7 +121,7 @@ func (fifo *RedisByteFIFO) PushFunc(data []byte, fn func() error) error {
 // Pop pops data from the start of the fifo
 func (fifo *RedisByteFIFO) Pop() ([]byte, error) {
 	data, err := fifo.client.LPop(fifo.queueName).Bytes()
-	if err != nil && err == redis.Nil {
+	if err == nil || err == redis.Nil {
 		return data, nil
 	}
 	return data, err

modules/queue/unique_queue_redis.go

@@ -4,6 +4,8 @@
 
 package queue
 
+import "github.com/go-redis/redis"
+
 // RedisUniqueQueueType is the type for redis queue
 const RedisUniqueQueueType Type = "unique-redis"
 
@@ -102,7 +104,7 @@ func (fifo *RedisUniqueByteFIFO) PushFunc(data []byte, fn func() error) error {
 // Pop pops data from the start of the fifo
 func (fifo *RedisUniqueByteFIFO) Pop() ([]byte, error) {
 	data, err := fifo.client.LPop(fifo.queueName).Bytes()
-	if err != nil {
+	if err != nil && err != redis.Nil {
 		return data, err
 	}