Feature Request please, change default variation when out of stock

Hello,

I always face this issue:

When default Variation is out of stock the Default Variation is removed, this a problem for me because i use google Merchant feed and i send 1 variation per product to google (the default one), but when its out of stock it doesn’t send a product. And as you know out of stock happens every day.

Please make that when default variation is out of stock, it changes to next cheapest variation, so products always have a default variation.

thank you

/Johnny