245e8d10c2
Backport #30357 by @yp05327 ![image](https://github.com/go-gitea/gitea/assets/18380374/ddf6ee84-2242-49b9-b066-bd8429ba4d76) When repo is a mirror, and commit author is an external user, then `GetUserByEmail` will return error. reproduce/test: - mirror Gitea to your instance - disable action and enable it again, this will trigger `DetectAndHandleSchedules` ps: also follow #24706, it only fixed normal runs, not scheduled runs. Co-authored-by: yp05327 <576951401@qq.com>