data status: doesn't work when using dvc with hydra when params.yaml is present, but not staged

[Danila89]

Description

dvc data status fails when hydra integration is involved.

Reproduce

git clone https://github.com/Danila89/dvc_empty.git && cd dvc_empty && dvc exp run -n something && dvc data status

Expected

dvc data status output

Environment information

Output of dvc doctor:

(base) danila.savenkov@RS-UNIT-0099 dvc_empty % dvc doctor
DVC version: 3.33.3 (pip)
-------------------------
Platform: Python 3.10.9 on macOS-13.3.1-arm64-arm-64bit
Subprojects:
        dvc_data = 2.22.6
        dvc_objects = 1.4.9
        dvc_render = 1.0.0
        dvc_task = 0.3.0
        scmrepo = 1.5.0
Supports:
        http (aiohttp = 3.8.4, aiohttp-retry = 2.8.3),
        https (aiohttp = 3.8.4, aiohttp-retry = 2.8.3),
        s3 (s3fs = 2023.5.0, boto3 = 1.26.76)
Config:
        Global: /Users/danila.savenkov/Library/Application Support/dvc
        System: /Library/Application Support/dvc
Cache types: reflink, hardlink, symlink
Cache directory: apfs on /dev/disk3s3s1
Caches: local
Remotes: None
Workspace directory: apfs on /dev/disk3s3s1
Repo: dvc, git
Repo.site_cache_dir: /Library/Caches/dvc/repo/64bbbded2e55036b006c56ceaefa98e1

Additional Information (if any):

Interesting detail: if params.yaml is committed to git - everything works:
git clone https://github.com/Danila89/dvc_empty.git && cd dvc_empty && git pull --all && git checkout dvc_data_status_issue && dvc data status

[dberenbaum]

Interesting detail: if params.yaml is committed to git - everything works:

That makes sense because dvc data status is comparing changes in the workspace to the Git HEAD (like a companion to git status). Once again, DVC considers the Git HEAD invalid here because there's no params.yaml. So I would say the behavior is expected, but we need a better error message.