Apply suggestion to lib/pleroma/notification.ex

lib/pleroma/notification.ex

@@ -367,7 +367,7 @@ defp do_create_notifications(%Activity{} = activity, options) do
         do_send = do_send && user in enabled_receivers
         create_notification(activity, user, do_send)
       end)
-      |> Enum.filter(& &1)
+      |> Enum.reject(&is_nil/1)
 
     {:ok, notifications}
   end