router: return error when registering nil handler #2815
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−3
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…nst nil handler; tests: add panic assertions for nil handler registration
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Currently,
router.insertonly logs a warning when a nil handler is registered,and continues processing. This can lead to runtime panics due to unnoticed misconfiguration.
This change makes router registration fail fast by returning an error
when a nil handler is provided, so that misconfigurations can be detected earlier.