Sync with git not working when there is a `.gitignore` file

### Which version of floccus are you using?

v5.2.3

### How many bookmarks do you have, roughly?

almost 320

### Are you using other means to sync bookmarks in parallel to floccus?

No

### Sync method

Git

### Which browser are you using?

Chromium

---

### Describe the Bug

Syncing with `git`.

I have a `.gitignore` file with the following content:
```
/*
!0/
0/*
!0/Config/
```
In summary: if ignores everything except the folder `0/Config/`

My bookmarks file is `0/Config/bookmarks.xbel`

With this setting, I'm getting **empty commits** produced by Floccus.

By removing the `.gitignore` file, it works ok again.

### Expected Behavior

I expected that the commits were not empty when syncing bookmarks with git

---

### To Reproduce

1. Create a git repository (let's say, in github or gitlab) and clone it.
2. Create a folder `0/` in it and a subfolder folder `0/Config` with an empty file `0/Config/.gitkeep` and also add a `.gitignore` file to the root directory with the content:
```
/*
!0/
0/*
!0/Config/
```
3. Add all, commit and push. (don't forget to use `git add -f` when adding the `.gitignore` file). The file tree will be like this:
```
│-- .gitignore
│
└───0
└───Config
-- .gitkeep
```

5. Add this repository to Floccus settings with git sync method with the path to bookmarks file: `0/Config/bookmarks.xbel`.

6. Add an bookmark, let's say, to `youtube.com` and see that commits produced by floccus are empty.

7. Delete the `.gitignore` file, commit and push. Now, add another bookmark and sync with Floccus. The commits are not empty anymore.

---

I created a [public repository here](https://github.com/Diogo-Rossi/test) reproducing the issue. The 3rd commit is empty. Fell free to ask any doubts.

Thankyou for this software!