[Backport] Fixed add to wishlist issue on product price 0

[sreichel]

Description

Backport #16537

Fixed Issues (if relevant)

1. Issue in adding the wishlist of "zero price" product.  #16479:Issue in adding the wishlist of "zero price" product

Manual testing scenarios

1. Login as a customer in front end of the website.
   2, Open product with zero price
   2, Click on the wishlist button in the product

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)

[sidolov]

Hi @sreichel , please, ensure that the issue #16479 reproduced on 2.1 release line, I see only two labels Reproduced applied.

[sreichel]

@magento-engcom-team give me 2.1.15 instance

[magento-engcom-team]

Hi @sreichel. Thank you for your request.
Unfortunately, I can only deploy instances for 2.2 and 2.3 release lines

[sreichel]

@sidolov I havent tested this with 2.1 (running PHP7.1), just checked the code for where getValue() is compared to ===false and found nothing.

How about change related unit tests to "zero price"?

Btw ... MAGETWO-73277 added same code to app/code/Magento/GroupedProduct/Pricing/Price/ConfiguredRegularPrice.php. Should this be fixed too?

[sidolov]

@sreichel , fix unit test according to changes is a good idea

[sidolov]

Hi @sreichel , we can't reproduce this issue on the latest 2.1-develop

Steps to reproduce:

1. Log in as a customer in frontend of the website.
2. Click on the wishlist button in the product.

Actual result:
The product is added to the wishlist.

[sreichel]

Closed due to lack of time.