awesome_nested_set help needed

Hello,

I've been using the brilliant awesome_nested_set gem to manage pages and their parents on my app, however I've run into what appears to be a simple challenge...

I use the helper nested_set_options to make life easier - however I can't see if there is an easy way I can get it to return a NULL option at the top of the select list? This would allow me to create pages that are roots.

Any advice would be greatly appreciated.

Kind regards, Ian