fix(sw, notification): Don't issue an event if there is no affect #8979
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Related to #8906 (comment)
What
updateの結果のうちaffectedが0である場合、readNotificationsまたはreadAllNotificationsイベントは発行されないように
Why
#8906 (comment) はバグではなく仕様ではあるが、イベントを毎度送る必要もなさそうなので、affectedが0の場合はイベントを発行しない。