Closes: #2156.
Tests:
- Remove a domain from System -> Config, 'letsencrypt revoke' action is not
invoked.
- Triggering a manual revoke operation still leads to action getting triggered.
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>