chore: log io throw unhandled messages

[stijnmoreels]

Log the failure of not having the right message handler for the message, instead of throwing an InvalidOperationException. This is due to the fact that a throwal in a custom message handler still corresponds as a 'handled' message. The responsibility of the message router stops there.

This is different from having no matching message handlers registered, in that case, we can still throw such an exception.

Closes #424

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