dvc list: Error on empty directory.

[karajan1001]

Bug Report

Got error message on an empty directory, shouldn't it show nothing? like ls command.

Description

Error when list a empty path, strange behavior.
Might relate to https://github.com/iterative/dvc/blob/daf07451f8e8f3e76a791c696b0ea175e8ed3ac1/dvc/repo/ls.py#L40-L41

Reproduce

1. git init
2. dvc init
3. mkdir empty
4. dvc list . empty

Expected

Show nothing like ls command

Environment information

DVC version: 2.0.17+7e4851

Platform: Python 3.8.8 on macOS-10.16-x86_64-i386-64bit
Supports: All remotes
Cache types: https://error.dvc.org/no-dvc-cache
Caches: local
Remotes: None
Workspace directory: apfs on /dev/disk3s1s1
Repo: dvc, git

Output of dvc doctor:

$ dvc doctor

Additional Information (if any):

[karajan1001]

We have already had a test about this.

https://github.com/iterative/dvc/blob/68897aa0def4e509a27d75f2e78106495d08e0c4/tests/func/test_ls.py#L167-L173

and it was introduced from #3246 at the beginning of dvc list command.

[evanrittenhouse]

@karajan1001 is this still open? New to open source, but would love to take a stab at it

[karajan1001]

open

Sorry, we had already had a PR for it (#6120) but was blocked by some refactoring. So maybe it is better to start with some other issues with good first issue.