Null check for partition value.

[anjagruenheid]

Summary

Issue] Briefly discuss the summary of the changes made in this
pull request in 2-3 lines.

Changes

• Client-facing API Changes
• Internal API Changes
• Bug Fixes
• New Features
• Performance Improvements
• Code Style
• Refactoring
• Documentation
• Tests

For all the boxes checked, please include additional details of the changes made in this pull request.

Testing Done

• Manually Tested on local docker setup. Please include commands ran, and their output.
• Added new tests for the changes made.
• Updated existing tests to reflect the changes made.
• No tests added or updated. Please explain why. If unsure, please feel free to ask for help.
• Some other form of testing like staging or soak time in production. Please explain.

For all the boxes checked, include a detailed description of the testing done for the changes made in this pull request.

Additional Information

• Breaking Changes
• Deprecations
• Large PR broken into smaller PRs, and PR plan linked in the description.

For all the boxes checked, include additional details of the changes made in this pull request.

[sumedhsakdeo]

Thanks Anja for the bug fix. Can we add a unit test that fails with this bug prior to fix and passes after the fix.

[sumedhsakdeo]

Thanks Anja. LGTM. Small nit: please update the description section Testing Done.

[teamurko]

lgtm, thank you for adding a unit-test! can we use Objects.toString, it handles null

[anjagruenheid]

lgtm, thank you for adding a unit-test! can we use Objects.toString, it handles null

Integrated, thanks for the review!