Fix iterate on null

[thomas-kl1]

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

Resolved issues:

1. resolves [Issue] Fix iterate on null #30830: Fix iterate on null

[m2-assistant]

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[sidolov]

@magento create issue

[sidolov]

@thomas-kl1 please cover changes at least with the unit test to avoid such issues in the future. Thank you!

[engcom-Charlie]

@thomas-kl1 I'll take care of test coverage.

[engcom-Charlie]

@magento run all tests

[engcom-Charlie]

@magento run all tests

[magento-engcom-team]

Hi @gabrieldagama, thank you for the review.
ENGCOM-8469 has been created to process this Pull Request
✳️ @gabrieldagama, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Delta]

✔️ QA passed
Manual testing scenario:

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

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

After:
✔️ No errors is shown on checkout shipping page

✔️ Message "Sorry, no quotes are available for this order at this time" is shown

[engcom-Delta]

Note: Automation tests are passed

[m2-assistant]

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