Allow empty selection for relationship id (NULL)

In my MySQL database, I have a table foo that has a field bar_id that is defined as allowing NULL.

CakePHP 1.3.6 baked some nice views for me, including foo/edit.ctp which contains "echo $this->Form->input('bar_id');" but the select menu this produces does not give me the option of not selecting something, which I want to be able to do.

I found an issue reported years ago about something like this which does not appear to be resolved:

http://cakephp.lighthouseapp.com/projects/42648-cakephp/tickets/909

That's about scaffolding, but I seem to be having the same problem with baked views.

What should I do to allow NULL selections for some of my relationships?

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