fix(fs): handle non-existent destination directory in file transfer (OpenListTeam#1898)

* fix(FileTransferTask): skip copying if destination directory does not exist

* pass only object not found error

---------

Co-authored-by: cyk <[email protected]>
Co-authored-by: KirCute <[email protected]>

Author: 3 people

internal/fs/copy_move.go

@@ -192,7 +192,9 @@ func (t *FileTransferTask) RunWithNextTaskCallback(f func(nextTask *FileTransfer
 		existedObjs := make(map[string]bool)
 		if t.TaskType == merge {
 			dstObjs, err := op.List(t.Ctx(), t.DstStorage, dstActualPath, model.ListArgs{})
-			if err != nil {
+			if err != nil && !errors.Is(err, errs.ObjectNotFound) {
+				// 目标文件夹不存在的情况不是错误，会在之后新建文件夹
+				// 这种情况显然不需要统计existedObjs，dstObjs保持为nil，下面这个for将不会执行
 				return errors.WithMessagef(err, "failed list dst [%s] objs", dstActualPath)
 			}
 			for _, obj := range dstObjs {