My understanding of a range of option buttons is that it implies not so much that one must always be selected, but that only one can be selected. I guess one can also get what SonOfEmidec1100 is saying, but what if there is a list of items, only one of which can be selected, but it is not necessary to select one? Credit goes to johnwm for his solution. What I have seen for this is having an extra option button, setting it to selected and making it invisible.
My 2 cents.