Given:
I have setup an alert using a webhook and have not configured an email server as I don't use it.

When:
The alert get's triggered

Then:
I see a warning in the log:

11:58:08.077 [QuartzScheduler_Worker-3] WARN  o.c.o.s.a.EmailNotificationService - The email service is not enabled and thus no email could be sent. Please check the Optimize documentation on how to enable email notifications!

Expected:
If the particular alert is not using email recipients we should not log this warning