[Issue] Fix iterate on null

[m2-assistant]

This issue is automatically created based on existing pull request: #30822: Fix iterate on null

---

Preconditions (*)

Magento 2.4-develop
If there is no carriers available on the store (no carriers modules), an iteration on null occurs.

Steps to reproduce

• Disable shipping modules:
  
• Create simple product
• Go to storefront
• Add product to cart
• Go to checkout page

Expected result (*)

1. No errors is shown on checkout shipping page
   
2. Message "Sorry, no quotes are available for this order at this time" is shown
   

Actual result (*)

1. Blank checkout page
2. Error "array_keys() expects parameter 1 to be array, null given" is recorded into exception.log
   

[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @engcom-Delta
Thank you for verifying the issue. Based on the provided information internal tickets MC-39291 were created

Issue Available: @engcom-Delta, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[magento-engcom-team]

Hi @m2-assistant[bot]. Thank you for your report.
The issue has been fixed in #30822 by @thomas-kl1 in 2.4-develop branch
Related commit(s):

• f5d692ffa6c1e81f9528686a20cfa556677b0fd5
• 73edcb1970607daf9e8843e2ff892c34345859e3
• 8fcac9d9bd81270a717f5311f774850a42980d5a
• 5029cb0c94227bf1ddbd239e9ff6ecbf75dbcce0
• e8294f84c1fde1072fecf197eee71737be7faf29

The fix will be available with the upcoming 2.4.3 release.