Describe the bug
When exporting annotation with Flashcard, the JSON line is undefined

    },
    undefined,
    {

To Reproduce
Steps to reproduce the behavior:

1. Annotate a line of text
2. Add a Flashcard with data on back and front
3. Export annotation as JSON
4. Search "undefined" you should get to that badly exported entry

Expected behavior

Fla

With CSS3 introducing content being set as list-style-type, this is being ignored by Weasyprint:

CSS:
ul {list-style-type: '-';} ul ul {list-style-type: '+';}

Console error:
WARNING: Ignored list-style-type:\"-\" at **, invalid value.
WARNING: Ignored list-style-type:\"+\" at **, invalid value.

OS : Windows 10
Version of Xournalpp : xournalpp-1.1.0+dev-nightly.20200924-windows.exe

Problem :
Under windows 10, when I double-click on a file whose name contains accents the pages are blank.
Under Windows 10, when I open it from menu "File->Open", I have the message "Could not open file"

When I rename the file without accents, there is no problem.

[Corrige.zip](https://github.com