Ground it
One of the fundamental reasons for grounding anything is to increase the likely-hood that a circuit breaker or fuse will trip/blow if there's a problem. In other words, if there's a problem, you find out right away... not later when someone unwittingly touches the ungrounded object with voltage on it while touching something else that is grounded.
It's so cheap and easy in your case. I recommend you take advantage of the easily accessible ground block.
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