nix flake lock refuses to create flake.lock

## Describe the bug

`nix flake lock` refuses to recreate a missing flake.lock:

```console
$ nix flake lock
error:
       … while fetching the input 'git+file:///home/julian/src/own/nix-configs'

       error: path '//home/julian/src/own/nix-configs/flake.lock' does not exist
```

## Steps To Reproduce

1. Have a merge conflict in flake.lock
2. Delete flake.lock: `rm flake.lock`
3. `nix flake lock`

## Expected behavior

flake.lock is recreated.

## Metadata

nix-env (Nix) 2.31.3

## Additional context

This looks like a regression. Works with lix.

## Checklist



- [x] checked [latest Nix manual] \([source])
- [x] checked [open bug issues and pull requests] for possible duplicates

[latest Nix manual]: https://nix.dev/manual/nix/development/
[source]: https://github.com/NixOS/nix/tree/master/doc/manual/source
[open bug issues and pull requests]: https://github.com/NixOS/nix/labels/bug

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Uh oh!

nix flake lock refuses to create flake.lock #15634

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Uh oh!

nix flake lock refuses to create flake.lock #15634

Description

Describe the bug

Steps To Reproduce

Expected behavior

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Checklist

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