You can add the missing color using, feed rules, supplement feed, manually add it or even in the primary feed. Lots of options, here is a guide on all the different methods: ruclips.net/video/P9neaNemcws/видео.html
Then no buy now button shows on your shopping listings. By default, regardless if you add the buy now button or not. The ad directs you to the product landing page. However, if you add the buy now button, you give consumers an extra option in your listings.
Make a video on how to fix missing value [color] in google merchant center next
You can add the missing color using, feed rules, supplement feed, manually add it or even in the primary feed. Lots of options, here is a guide on all the different methods: ruclips.net/video/P9neaNemcws/видео.html
So what happens when you choose not to include the checkout link? Does it take them to the product page instead?
Then no buy now button shows on your shopping listings. By default, regardless if you add the buy now button or not. The ad directs you to the product landing page. However, if you add the buy now button, you give consumers an extra option in your listings.