Webdav propfind lockdiscovery returns 404 on an locked item

## Describe the bug
We've found a bug that in some cases a propfind which requests `` on an locked file returns an
404, while the same request in **oc10 works as expected**.

## Steps to reproduce

Steps to reproduce the behavior:

1. Lock a file in ocis.
2. Request a propfind with the following payload
```

```
3. The response returns lockdiscovery 404

HOWEVER: If you send a propfind with just lockdiscovery it works fine

## Expected behavior
Response Body should contain the found lock

## Actual behavior
Response Body returns lockdiscovery 404

Feel free to contact me if you have questions.