fix(sheet): set selection should ensure the selection is not null

[VicKun4937]

• Fix the issue where cell selection is lost after unmerging cells.

[github-actions]

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[github-actions]

Playwright test results

 4 passed

Details

 4 tests across 2 suites
 1 minute, 23 seconds
 bc124bb
 For more information, see full report

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.93%. Comparing base (86c2dd9) to head (bc124bb).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #3497   +/-   ##
=======================================
  Coverage   30.93%   30.93%           
=======================================
  Files        2159     2159           
  Lines      113354   113354           
  Branches    24863    24863           
=======================================
  Hits        35065    35065           
  Misses      78289    78289           

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