Update group expanding for empty cells

[vitPinchuk]

Resolves: #147

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.77%. Comparing base (614cbd6) to head (675367c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #169 +/- ## ======================================= Coverage 99.77% 99.77% ======================================= Files 163 163 Lines 2617 2629 +12 Branches 579 602 +23 ======================================= + Hits 2611 2623 +12 Misses 6 6 ```

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