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Summary: When the `getSummarySourceGroup` function (used by the `$group` column) finds that the group is empty, raise a new special exception `EmptySummaryRow`. The engine catches this exception, avoids saving a value to the cell, and removes the record. Test Plan: Updated several Python tests Reviewers: georgegevoian Reviewed By: georgegevoian Subscribers: dsagal Differential Revision: https://phab.getgrist.com/D3489