[FIX] Magento_Ui: Return empty string when the given date column is undefined

[tedsalmon]

Description

Return empty string when the given date column is undefined in a grid

Fixed Issues (if relevant)

1. Undefined Date Columns in Grid Default to current date / time #12461: Undefined Date Columns in Grid Default to current date / time

Manual testing scenarios

1. Select a date column that has undefined values in a grid
2. Verify that undefined values are showing up as empty string and not the current date and time

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-cicd2]

All committers have signed the CLA.

[mzeis]

Hi,

thank you for your PR! Please can you have a look at the failing travis build? Thanks!

[tedsalmon]

@mzeis,

Good catch! I wasn't familiar with the JS linter. The build should go 💚 soon and I've already rebased to squash the commits.

Thanks!
-Ted

[mzeis]

Great, thanks for the quick fix! I'll let you know if the interal tests show any problems.

The CET indicated in #12461 that this is fixed in 2.3-develop. As the code is still the same in https://github.com/magento/magento2/blob/2.3-develop/app/code/Magento/Ui/view/base/web/js/grid/columns/date.js#L39, can you confirm if this is really true?

[tedsalmon]

@mzeis,

I can confirm that the linked fix works correctly, so I guess that makes my PR useless :)

FYI @ihor-sviziev

Thanks!
-Ted

[mzeis]

@tedsalmon I'll ask around to find out how the problem was fixed in 2.3-develop. If it's a small change it could possibly fixed in 2.2.x too (unless 2.3 is good enough for you).

[tedsalmon]

@mzeis,

The fix should just be this portion of the 2.3 code && value[this.index]. If it doesn't matter, I'll just backport that for this PR, since it's a cleaner solution than mine.

Thanks!
-Ted
cc @ihor-sviziev

[mzeis]

@tedsalmon and me found out this is a duplicate of #11749 so I'm closing this one. It will be fixed in 2.2.2.

[ihor-sviziev]

FYI this issue was also fixed in 2.1-develop branch in #12033