Condition for checking param is not falsy?

I need to ensure a parameter, if provided, does not contain a falsy value (`''`, `0`, `false`, `null`, `undefined`, etc.). As far as I can tell, the "notEquals" operator would be unwieldy because it uses `!==` so I'd have to check each possibility separately. Is that the only built-in way? Must this be a custom operator?

首先檢視 rules engine 現有的條件運算子，尤其是 notEquals 運算子和 custom-operator 入口點。判斷檢查任何 falsy 參數值應該是內建條件還是自訂運算子，然後新增測試涵蓋範圍與文件，展示對 '', 0, false、null 和 undefined 的預期行為。

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