Location list stays open when empty

[AdrienLemaire]

Information

VIM version

NVIM v0.4.3
Build type: Release

PlugUpdate shows - ale: Already up to date.

Operating System: Arch linux

What went wrong

Whenever I write some python code and flake8 stop a linting error, saving the file will have black auto-fix the issue. I'm expecting :lclose to be auto-executed because the location list is now empty, but the location list stays open

Related to #2460.

Reproducing the bug

let g:ale_fixers = {
\   '*': ['remove_trailing_lines', 'trim_whitespace'],
\   'python': ['black'],
\ }
let g:ale_linters = {
\   'python': ['flake8'],
\}

:ALEInfo

https://gist.github.com/AdrienLemaire/7b37ed6386d1419c0d9799908a1edd78