lab mr checkout 39: mr_checkout.go:33: the key `remote.origin.url` is not found

I'm trying to checkout a MR:

```sh
lab mr checkout 39
```

But my checkout doesn't have an `origin` remote:

```sh
❯ git remote -v
github	git@www-github.foo.com:org/repo.git (fetch)
github	git@www-github.foo.com:org/repo.git (push)
gitlab	git@192.16.50.1:org/repo.git (fetch)
gitlab	git@192.16.50.1:org/repo.git (push)
```

How to deal with cases like this?

Thanks!