[fix] Hide cat error if tmp_backup_dir_file doesn't exist in conf_regen
[fix] Hide cat error if tmp_backup_dir_file doesn't exist in conf_regen

YunoHost/yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost