If you use the Validation plugin (here: http://jqueryvalidation.org/) and update your to supply value on each , if will prevent form submission if the "empty" value is selected:
It's also worth noting that the only valid child elements of a is either or , so remove those
If jQuery is not an option, you could always add an onclick to the select or an onsubmit to the form and do a quick check on an empty string (or whatever you set the default value to).
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