Merge branch 'wip/jfelder/customsorter-null' into 'master'
authorEmmanuele Bassi <ebassi@gmail.com>
Fri, 4 Dec 2020 23:39:48 +0000 (23:39 +0000)
committerEmmanuele Bassi <ebassi@gmail.com>
Fri, 4 Dec 2020 23:39:48 +0000 (23:39 +0000)
customsorter: Add missing nullable annotation

See merge request GNOME/gtk!2923


Trivial merge