[Backport] Issue #20380 fixed for 2.2

[mahesh-rajawat]

Fixed issue #20380 for Magento 2.2.

Description (*)

Reference PR #20381

Fixed Issues (if relevant)

1. Order shipping method bug #20381
2. ...

Manual testing scenarios (*)

1. Create a downloadable or virtual product.
2. Place an order with this product.
3. In custom controller or anywhere load order with id.
   $order = $this->orderFactory->create()->load($orderId); //your order id
4. Now get shipping method as object.
   $order->getShippingMethod(true)->getMethod();
   It returns Null now.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @maheshWebkul721. Thank you for your contribution
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[VladimirZaets]

@magento-engcom-team give me 2.3-develop instance

[magento-engcom-team]

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[magento-engcom-team]

Hi @rogyar, thank you for the review.
ENGCOM-4361 has been created to process this Pull Request

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