Fix NPE after a clustering plan is finished

[beyond1920]

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Change Logs

Fix NullPointerException after a clustering plan is finished

Impact

None

Risk level (write none, low medium or high below)

None

Documentation Update

None

Contributor's checklist

• [ ] Read through contributor's guide
• [ ] Change Logs and Impact were stated clearly
• [ ] Adequate tests were added if applicable
• [ ] CI passed

[hudi-bot]

CI report:

• fce22b2e55a9dcf09b57fd3d60f552dccb389575 Azure: FAILURE

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