[Backport] Resolved undefined index issue for import adapter

[amol2jcommerce]

Original Pull Request

#19765

Description (*)

Added a condition to check if 'sku' column exists in CSV file before setting its value.

Fixed Issues (if relevant)

1. Custom import adapter data validation issue #19761: Custom import adapter data validation issue

Manual testing scenarios (*)

1. Create a custom import adapter extending Magento\ImportExport\Model\Import\Entity\AbstractEntity
2. Add valid columns in getValidColumnNames() function.
   e.g. ['column1', 'column2', 'column3']
3. Create CSV file with columns stated above and add data.
4. Go to System > Import
5. Select your adapter from "Entity Type" dropdown
6. Select your CSV file in "Select File to Import" field.
7. Click on "Check Data" button
8. CSV file should get validated if column and data are available

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)

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[magento-engcom-team]

Hi @rogyar, thank you for the review.
ENGCOM-5030 has been created to process this Pull Request

[Nazar65]

HI @amol2jcommerce based on this comment #19761 (comment) fix for forward port must be reverted and refactored.

[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-5030 has been created to process this Pull Request

[Nazar65]

QA Passed ✔️

[m2-assistant]

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