UnboundLocalError when using pypinyin conversion functions

UnboundLocalError when using pypinyin conversion functions: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). When calling lazy pinyin() or pinyin() functions, an UnboundLocalError is raised for the variable post data being referenced before assignment.

The task

When calling `lazy_pinyin()` or `pinyin()` functions, an `UnboundLocalError` is raised for the variable `post_data` being referenced before assignment.

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