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insert rows method fails with UnboundLocalError when called

insert rows method fails with UnboundLocalError when called: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). The insert rows method in the Worksheet class is throwing an UnboundLocalError when attempting to insert rows into a spreadsheet.

The task

The `insert_rows` method in the Worksheet class is throwing an `UnboundLocalError` when attempting to insert rows into a spreadsheet.

Part of keryszhan/harbor-swesmith-rl-artifacts.