Activities IManager throws an BadMethodCallException

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

lib/public/Activity/IManager.php

@@ -64,6 +64,7 @@ interface IManager {
 	 *  - setSubject()
 	 *
 	 * @param IEvent $event
+	 * @throws \BadMethodCallException if required values have not been set
 	 * @since 8.2.0
 	 */
 	public function publish(IEvent $event);