WooCommerce Analytics: check if product exists before we use it

[jeherve]

Fixes #35562

Proposed changes:

Account for all possible returns from wc_get_product when checking for the different items present in a cart. It should avoid issues like the one reported in #35562.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

• N/A

Does this pull request change what data or activity we track or use?

• No

Testing instructions:

• Start with a site connected to WordPress.com and where WooCommerce is installed and configured.
• Create a product A
• Make a purchase of product A until /checkout/order-received/<order-id>/—this fires capture_order_confirmation_view

  jetpack/projects/plugins/jetpack/modules/woocommerce-analytics/classes/class-jetpack-woocommerce-analytics-checkout-flow.php

  Lines 35 to 37 in e49db6b

  	// order confirmed page view
  	add_action( 'woocommerce_thankyou', array( $this, 'capture_order_confirmation_view' ), 10, 1 );

• Delete product A
• Visit again /checkout/order-received/<order-id>/
  • It should not trigger anything in your logs.

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the fix/wc-product-fatal branch.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack fix/wc-product-fatal
  

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[github-actions]

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[gedex]

the last condition, ! $product instanceof WC_Product, should be sufficient

[gedex]

Tested and works as expected. Thanks, @jeherve!