Serialize ajax form values succeeds even when no autoNumeric initialized elements contained in form.

It is too large a burden on developers to determine if there are initialized autoNumeric elements in a form and choosing a serialization process based on the determination.

This small change allows every form submitted through ajax to be serialized with autoNumeric('getString') without autoNumeric errors. The result when no autoNumeric initialized elements are found is exactly the result from jQuery's serialize() so the risk is very low.