SAK-44280 T&Qs : Fix MCSC default settings on edit (#8739)
The way it's being saved right now, the value can't ever be null. But if
it is false with no discount, then it means no option was selected (or
the discount would have no effect).
(cherry picked from commit 2854c9638c9348311b1b13b22559d3b9c2a58921)