Can't open users in editor after update

[Dave Shoreman]

Once you update a user, if you try to open that user back in the editor, it fails and displays a blank form. It seems to be an issue with updating the user's groups as it only affects the user being saved.

Replication Steps

1. Click any user (e.g. ubuntu) in System/Users to open the editor
2. Add a new group from the list
3. Click Update
4. Try to open that same user without reloading the page

Expectation

The user is updated, and loaded back up with its new details in the editor

Reality

An error is thrown in the console, and instead of seeing the editor populated with the user details, you get an empty Create form.

Error details:

[Vue warn]: Error in render: "TypeError: _vm.tmpUser.groups is undefined"

found in

---> <SystemUserEditor> at resources/js/components/System/UserEditor.vue
       <SuiGridColumn>
         <SuiGrid>
           <SystemUsers> at resources/js/components/System/Users.vue
             <Servidor> at resources/js/layouts/Servidor.vue
               <Root>

[Olivier Lechevalier]

@dshoreman let me see if I can fix it 🤔