If "Pay later option" is checked, hide Billing Name and Address fields as well as Credit Card info fields

User should not be prompted for Credit / Debit Card info or for Billing Name and Address if they check the Pay Later option.

For event registration and online contribution pages where the selected payment processor causes these 2 blocks of fields to be included... add javascript which hides these blocks when Pay Later is checked.

(I'm not sure if there are cases where we include the credit card fields but NOT the Billing Name / Address block - or vice versa. If so, please make sure the hide code handles these combinations of conditions.)

Also, make sure we don't create an empty Billing location.