get json string() method in PrettyTable is broken

get json string() method in PrettyTable is broken: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). Currently, the get json string() method in PrettyTable doesn't work correctly. When trying to convert a PrettyTable to JSON, the method returns incomplete or…

The task

Currently, the `get_json_string()` method in PrettyTable doesn't work correctly. When trying to convert a PrettyTable to JSON, the method returns incomplete or incorrect JSON data.

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