Fix error when Google Merchant Center account is undefined

[jorgemd24]

Changes proposed in this Pull Request:

Closes https://wordpress.org/support/topic/typeerror-cannot-read-properties-of-undefined-2/

This PR fixes an issue where googleMCAccount is undefined when checking if notification_service_enabled is active. This can happen if the Google account isn’t connected or is missing scopes, leading to the following error:

Cannot read properties of undefined (reading ‘notification_service_enabled’)

google-listings-and-ads/js/src/hooks/useGoogleMCAccount.js

Lines 37 to 47 in 90e9747

	if ( ! google || google.active === 'no' || ! scope.gmcRequired ) {
	return {
	googleMCAccount: undefined,
	isResolving: isResolvingGoogle,
	hasFinishedResolution: hasFinishedResolutionGoogle,
	// If a user has not yet connected their Google account or the connected Google account
	// has not been granted necessary access permissions for Google Merchant Center, then
	// the precondition doesn't meet.
	isPreconditionReady: false,
	};
	}

Screenshots:

Detailed test instructions:

1. Go here:

   google-listings-and-ads/src/API/Site/Controllers/Google/AccountController.php

   Line 168 in 90e9747

   'active' => array_key_exists( 'status', $status ) && ( 'connected' === $status['status'] ) ? 'yes' : 'no',

   and set the active to no
2. Go to the Settings page.
3. Check that you don't see the following error:

Additional details:

Changelog entry

Fix - Error when Google Merchant Center account is undefined while checking the notification service enabled property.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.7%. Comparing base (b80d149) to head (90e9747).

Additional details and impacted files

@@             Coverage Diff              @@
##             develop   #2518      +/-   ##
============================================
- Coverage       64.7%   63.7%    -1.0%     
============================================
  Files            798     326     -472     
  Lines          22940    5084   -17856     
  Branches        1222    1228       +6     
============================================
- Hits           14844    3240   -11604     
+ Misses          7930    1677    -6253     
- Partials         166     167       +1     

Flag	Coverage Δ
js-unit-tests	63.7% <100.0%> (-<0.1%)	⬇️
php-unit-tests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...s/src/components/enable-new-product-sync-notice.js	100.0% <100.0%> (ø)

... and 477 files with indirect coverage changes

[puntope]

LGTM