* Fix #15669: always populate instance map even if it was empty * Fix some tests * Fix more tests * Newsfile Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org> * CI fix: don't forget to update apt repository sources before installing olddeps deps * Add test testing the backwards compatibility --------- Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>