Checkout - Infinite loading indicator when server returned error

[ihor-sviziev]

Preconditions

1. Magento 2.2.6

Steps to reproduce

1. Create any simple product
2. Add to cart it on frontend and go to checkout
3. Open Chrome Dev Tools
4. Fill up shipping in US with any address
5. Find request to request like this: https://test-magento-instance.com/rest/default/V1/guest-carts/gFgmi7qopaxOgxlbXQ3hEo2Ny8gkNXXl/estimate-shipping-methods
6. Right click on this request on click "Block request URL" in order to emulate that we can't connect to server or server returned an error
   
7. Change zipcode in shipping address and see that estimate-shipping-methods request was blocked in Dev Tools:
   

Expected result

1. Loading indicator should be hidden
2. No shipping methods should be available

Actual result

1. Infinite scrolling in "Shipping methods" appeared

Additional info

Issue appearing here:
https://test-magento-instance.com/pub/static/version1538398224/frontend/Magento/luma/en_US/Magento_Checkout/js/model/shipping-rate-processor/new-address.js contains following line - errorProcessor tries to process response

but it can't process JSON.parse on empty string and throwing exception:

As result we "always" section in new-address.js file is not processed.

We have following JS error in console:

PS: I tested it on following test instance: https://i-18112-2-2-6.engcom.dev.magento.com/test.html

[magento-engcom-team]

Hi @ihor-sviziev. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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• Information on your environment
• Steps to reproduce
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

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where $VERSION is version tags (starting from 2.2.0+) or develop branches (for example: 2.3-develop).
For more details, please, review the Magento Contributor Assistant documentation.

@ihor-sviziev do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[magento-engcom-team]

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

@ihor-sviziev Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-95448, MAGETWO-95449 were created