"index out of bounds: the len is 2 but the index is 2" on older systemctl

[FinitelyFailed]

Hi,

I'm using this crate on a device running Linux (Yocto Dunfel), which run systemctl 244.
Where "systemctl list-unit-files" gives me:

UNIT FILE                              STATE          
-.mount                                generated      
boot.mount                             generated      
data.mount                             generated      
dev-hugepages.mount                    static         
dev-mqueue.mount                       static         
sys-fs-fuse-connections.mount          static         
sys-kernel-config.mount                static         
sys-kernel-debug.mount                 static         
tmp.mount                              static         
var-volatile.mount                     generated      
systemd-ask-password-console.path      static         
systemd-ask-password-wall.path         static         
alsa-restore.service                   static         
alsa-state.service                     static         
apmd.service                           static         
autovt@.service                        enabled             
bluetooth.service                      enabled        
bthelper@.service                      static         
busybox-klogd.service                  enabled        
busybox-syslog.service                 enabled        
console-getty.service                  disabled       
container-getty@.service               static         
containerd.service                     disabled       
crond.service                          enabled        
dbus-org.bluez.service                 enabled        
dbus-org.freedesktop.hostname1.service static         
dbus-org.freedesktop.locale1.service   static         
dbus-org.freedesktop.login1.service    static         
dbus-org.freedesktop.network1.service  enabled        
dbus-org.freedesktop.resolve1.service  enabled        
dbus-org.freedesktop.timedate1.service static         
dbus-org.freedesktop.timesync1.service enabled        
dbus.service                           static         
debug-shell.service                    disabled  

I.e. the third column "VENDOR PRESET" doesn't exist.

So when I run e.g. "systemctl::exists" in my code it panics.

It looks lite this line is the culprit.