When value not required, accept missing value when currency is set

I don't know if this should be a bug or a feature request.

I think it would be useful if when the Money CCK is set to optional, and a default currency is set, it allows it to be saved without having to change the currency to the default -- Select Currency --

Here is my scenario:
- I set the money CCK field to be optional
- I set a default currency to EUR
(I only need to use one currency (EUR) for my site)

The form shows an empty value and the default currency - all it ok up until now.

- When the user saves the node, it gives a warning that the optional money CCK field has not been filled out - because there is a currency type set but no value specified.