feat: return when no object in primary/secondary case

feat: add debug log

fix: wording

store/piecestore/storage/oss.go

@@ -89,6 +89,11 @@ func (o *ossStore) DeleteObjectsByPrefix(ctx context.Context, key string) (uint6
 			return size, err
 		}
 
+		if len(objs) == 0 {
+			log.CtxDebugw(ctx, "No object listed in oss by prefix", "prefix", key)
+			return 0, nil
+		}
+
 		// if the object listed here is less than required batch size, meaning it is the last page
 		if int64(len(objs)) < batchSize {
 			continueDeleteObject = false

store/piecestore/storage/s3.go

@@ -156,6 +156,11 @@ func (s *s3Store) DeleteObjectsByPrefix(ctx context.Context, key string) (uint64
 			return size, err
 		}
 
+		if len(objs) == 0 {
+			log.CtxDebugw(ctx, "No object listed in s3 by prefix", "prefix", key)
+			return 0, nil
+		}
+
 		if int64(len(objs)) < batchSize {
 			continueDeleteObject = false
 		}