Some steps of the signup flow perform unexpected function calls

[dzver]

Steps to reproduce

1. Starting at URL: /start/launch-site with a new site
2. Select Free plan and Free domain

What I expected

• To not run add to cart functions
• To not fetch an empty cart from the server before adding items to it

What happened instead

Add to cart with empty parameters.

I'm not sure if that has any negative impact on the code but debugging it is confusing. I think adding some more ifs so that empty domains/plans don't go to the cart functions.

[razvanpapadopol]

I think @Automattic/shilling did some work recently on adding to cart functionality. Is this still an issue?

[sirbrillig]

Add to cart with empty parameters.

Interesting! I'm not sure, but it sounds like this could have been related to the fix in #52560

I just did a quick test of this flow, and I do see that signup still fetches the cart twice (once on the first launch flow page, and once on the second page), although nothing is added to the cart, so I'm not sure if that means this issue is resolved or not.