Forms Created with `bootstrap_form_with` Without Model Fail for Placeholder

[lcreid]

The following will blow up with a no method for nil exception:

<%= bootstrap_form_with(url: send_new_email_confirmation_token_path) do |form| %>
  <%= form.email_field(:email, label_as_placeholder: true) %>
  <%= form.submit("Send me a confirmation link", class: "btn btn-primary btn-sm") %>
<% end %>