A4A Dev Sites: Fix marketplaceType when referralBlogId is missing

[phcp]

Proposed Changes

• Fix marketplaceType when referralBlogId is missing. When setting defaultMarketplaceType the Checkout component gives priority to the param, so we need to set it to undefined when there is no referralBlogId.

Why are these changes being made?

pdDOJh-3Cl-p2

Testing Instructions

• Apply this PR to your local
• Go to http://agencies.localhost:3000/referrals/dashboard
• Click on New Referral
• Add products to the cart
• Click on the cart icon and then Checkout
• You should see the Referral Checkout page with the correct products in the cart
• Submit the referral and verify if the email is correct
• Regression test, try a referral for a dev site

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-117949

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-117949&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-117949&env=a8c-for-agencies

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug fix/a4a-referral-checkout on your sandbox.

[ivan-ottinger]

The proposed change looks good and works as expected. 👌🏼 I did not observe any regressions.