don't update last synchronization messsage if no account has been synchronized

In case of general error (as eg no network connection), each synchronization try conducts to an update of the “last synchronization” field at the bottom left of the screen, even if nothing was successfully done (all in error).
could you skip the update process in such a case?
Of course, with several accounts, it is possible that one is down and another OK: in such  a situation, you should keep updating the field.