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fix(submissions): fix bulk update raises 500 instead of 400 DEV-1131 (#6423)

### 📣 Summary
Fixes a server error in bulk update by handling `None` results
gracefully.

### 📖 Description
If a `backend_result` result is `None`, the response now returns a
proper 400 instead of causing a 500.

See:
https://github.com/kobotoolbox/kpi/pull/6281#issuecomment-3371644513

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