question about method "hidden_div_if" in AWDR 2

[11175]

I followed the sample code in AWDR 2 like this:

store_helper.rb

def hidden_div_if(conditions, attributes = {})
  if conditions
    attributes["style"] = "display:none"
  else
    attr = tag_options(attributes.stringify_keys)
    "<div #{attr}>"
  end
end

store.html.erb

<%= hidden_div_if(@cart.items.empty?, :id => "cart") %>
  <%= render(:partial => "cart", :object => @cart) %>
</div>

when the cart is empty, the "<div id=... class=...>" snippet is not
displayed there.

could anybody help me with this?

[11175]

sorry for the mistake, I didn't read the sample code carefully.

there's no "if..else..end" structure in this method.