Description

It is possible that changing sheets with custom editors cause the map currentCellKeysToEditorIdMap to not be updated in time under heavy load. This causes a NPE since the check for whether the map is null is done after copying the map. This PR does not change the underlying mechanism, but fixes the logic of checking for a null map.

The related issue should not be closed, but should be debugged further and verified whether a fix is needed.

Type of change

• Bugfix
• Feature

Checklist

• I have read the contribution guide: https://vaadin.com/docs/latest/contributing/overview
• I have added a description following the guideline.
• The issue is created in the corresponding repository and I have referenced it.
• I have added tests to ensure my change is effective and works as intended.
• New and existing tests are passing locally with my change.
• I have performed self-review and corrected misspellings.