Add groups to users properly

scripts/Common/OS/users.fish

@@ -5,10 +5,11 @@ set -l users (getUsers)
 
 
 for name in (echo "$users" | jq '.[]' --raw-output0 | string split0)
-    function getUserConfig -S -a config
+    function getUserConfig -V name -a config
         getConfig "valhalla.users.$name.$config" $argv[2..]
     end
 
+    set -l groups (getUserConfig groups --apply 'builtins.concatStringsSep ","');
     set -l displayName (getUserConfig displayName --json)
     set -l shell (getUserConfig defaultShell --json)
 
@@ -17,8 +18,12 @@ for name in (echo "$users" | jq '.[]' --raw-output0 | string split0)
                 echo "--comment"
                 echo "$displayName" | jq --raw-output
             end
-        ) --groups (getUserConfig groups --apply 'builtins.concatStringsSep ","') \
-        "$name"
+        ) (
+            if [ -n "$groups" ]
+                echo "--groups"
+                echo "$groups"
+            end
+        ) "$name"
 
     if echo "$shell" | jq --exit-status > /dev/null
         sudo chsh "$name" --shell (which (echo "$shell" | jq --raw-output))