[Issue] Import/Export - Fix 'entity values are mixed' exception when no valid data

[m2-assistant]

This issue is automatically created based on existing pull request: #32904: Import/Export - Fix 'entity values are mixed' exception when no valid data

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Description

The Import/Export module can operate in two modes: skip errors, stop on error. When configured to skip errors, the import will proceed irrespective of the validation result. When there is no data to import, a exception "entity values are mixed" is thrown. This pull request solves the problem by failing validation in this case.

Related Pull Requests

Fixed Issues

1. Fixes Error in data structure: entity values are mixed firegento/FireGento_FastSimpleImport2#109

Manual testing scenarios

1. Create an import file with only invalid data (eg, SKUs that don't exist, invalid customer address fields, malformed customer email addresses)
2. Configure the Magento importer to skip validation errors
3. Import the file
4. Without this pull request: validation passes, but the import fails with a message that "entity values are mixed"
5. With this pull request: validation fails with a message saying that "There are no valid rows to import."

Questions or comments

none

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)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

[m2-assistant]

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

✅ Confirmed by @krishprakash
Thank you for verifying the issue. Based on the provided information internal tickets MC-42364 were created

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