Revert "Revert "Use ExceptionNotifier.notify_exception""

This reverts commit 965f8b28ec330539680d09e16adb15e134c46d9c.
update exception_notification tests for 4.0.0
Merge pull request #1059 from turbovote/exception-notification-4.0.0

Revert "Revert "Use ExceptionNotifier.notify_exception""