fix(notifications): Update notifier exception handling

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

apps/dav/lib/CardDAV/Notification/Notifier.php

@@ -8,7 +8,6 @@
  */
 namespace OCA\DAV\CardDAV\Notification;
 
-use InvalidArgumentException;
 use OCA\DAV\AppInfo\Application;
 use OCP\IL10N;
 use OCP\L10N\IFactory;
@@ -42,7 +41,7 @@ public function getName(): string {
 	 */
 	public function prepare(INotification $notification, string $languageCode): INotification {
 		if ($notification->getApp() !== Application::APP_ID) {
-			throw new InvalidArgumentException();
+			throw new UnknownNotificationException();
 		}
 
 		$l = $this->l10nFactory->get(Application::APP_ID, $languageCode);