git LFS data directory cleanup

[8ctopus]

• Gitea version (or commit ref): 1.10.0-rc1
• Git version: 2.17.1
• Operating system: Ubuntu 18.04.3 LTS
• Database (use [x]):
  • MySQL
• Can you reproduce the bug at https://try.gitea.io:
  • Not relevant

1.10.0-rc1 fixes #8423, however I've noticed that empty directories are not deleted. It's not a big deal but could be cleaner.

.:
total 12
drwxr-xr-x 3 gitea gitea 4096 Oct 15 04:50 .
drwxr-xr-x 3 gitea gitea 4096 Oct  3 11:30 ..
drwxr-x--- 3 gitea gitea 4096 Oct 15 04:50 e6

./e6:
total 12
drwxr-x--- 3 gitea gitea 4096 Oct 15 04:50 .
drwxr-xr-x 3 gitea gitea 4096 Oct 15 04:50 ..
drwxr-x--- 2 gitea gitea 4096 Oct 15 04:51 e4

./e6/e4:
total 8
drwxr-x--- 2 gitea gitea 4096 Oct 15 04:51 .
drwxr-x--- 3 gitea gitea 4096 Oct 15 04:50 ..

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs during the next 2 weeks. Thank you for your contributions.

[lunny]

I think this has been resolved by #22385

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