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Not out of the ordinary. I think in general most code requires a railing for four or more steps.
I'm not sure if that includes the deck.
This keeps people who fall/slip sideways from going very far and breaking something. Imagine if you had a sharp spiked fence next to the shrubs, and granny is walking up during an icestorm.
You should be able to easily find some black iron/al rails that match the top at one of the box stores, and/or special order them from the lumberyard.
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