How core preferences should work?

[Jimmi08]

Ok, I know, that you can't add core preferences. The list of preferences is set.

But you can delete core pref in Database/Tools. So what I did to kill my site?

I tried to use admin mobile theme by Alex. Just testing, nothing more.

Because no changes were applied, I went to Database/Tools and deleted admincss pref {I supposed it will be generated again)

The result was unfinished redirection and no way how to fix it.

This code in auth.php failed:

if(empty($admincss) || $admincss === 'style.css'|| $admincss === 'admin_dark.css' || $admincss === 'admin_light.css')
{
	$core->update('admincss','css/modern-light.css');
	$core->save(false,true);
	e107::getRedirect()->redirect(e_SELF);
}

to get my site back I add to change , because update() will not update missing preference.
$core->update('admincss','css/modern-light.css'); to $core->add('admincss','css/modern-light.css');

I think that if you delete core preferences from admin Tools, then:

• either just empty it
• either add missing keys by default