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events: check signal before listener
In WPT Events, TypeError is expected if both listener and signal are null. But checking listener doesn't throw TypeError. So check signal before listener because checking signal throws TypeError if signal is null. PR-URL: #46054 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
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