v0/subjects/{subject_id}/persons 部分条目的人员信息有缺失

例如 条目 93739（[乒乓](https://bgm.tv/subject/93739)）和 37785（[来自新世界](https://bgm.tv/subject/37785)）都没有导演对应的键值

使用请求
`https://api.bgm.tv/v0/subjects/37785/persons`
获得的 [结果](https://api.bgm.tv/v0/subjects/37785/persons) 中并没有导演

大部分缺失导演的条目为一些衍生小动画，但也有如上例子的经典作品

Start by requesting v0/subjects/37785/persons and compare the response with the reported absence of the director entry; also check subject 93739. Trace the endpoint handling for these subject-person results, and consider the issue done when affected subjects return the expected director information without regressing other person data.

Written by the indexing model from the issue text.