Cannot edit a TeamCity user without filling in mandatory notifier field

[rfulwell]

For example, I would like to reset a user password from the Admin web UI but when I click the 'Save' button the button simply shakes and does not save the data.

Tracing the network activity from the browser, we see this server response:
notificator_SlackNotificator_slack.Verbose:Please use True/False or Yes/No to declare if you want Verbose Slack Messages.

This can be worked around by putting a value in the required field but needless to say, this is a bit of an obscure problem that can hit at the worst time (when a user needs a password reset).

It may be that the TeamCity infrastructure is not properly surfacing the error that is returned over the REST API, but in any case, it would be nice if it could be fixed from the notifier end.