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Certain errors result in request being null

Certain errors result in request being null: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). This is very much unexpected in the onSend hook and this also makes it more difficult to access the req object in the error handler.

The task

This is very much unexpected in the `onSend` hook and this also makes it more difficult to access the `req` object in the error handler.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.