LPS-47238 

When creating a structure in 6.1.10 we add empty xml attributes of "index-type" to an option in a select list. This causes a problem when upgrading because we do not check for the "index-type" attribute when the item is an "option" of a select list.

I would just remove the attribute from the "option" during the upgrade but the customer may be using it for some reason. Instead we can safely perform the same operation for "index-type" for the "option" element as we do for the "select list" element.