plugin misc account: fixed handling of None/empty values in sendEmails.sendEmail

src/plugins/plugin_misc_account.py

@@ -284,10 +284,10 @@ class MiscAccount(object):
                             email_from.encode("utf-8"),
                             [email.encode("utf-8") for email in recipients],
                             msg.as_string(),
-                            senderDomainName=email_sender_domain.encode("utf-8"),
+                            senderDomainName=email_sender_domain.encode("utf-8") if email_sender_domain else None,
                             port=email_port,
-                            username=email_username.encode("utf-8"),
-                            password=email_password.encode("utf-8"),
+                            username=email_username.encode("utf-8") if email_username else None,
+                            password=email_password.encode("utf-8") if email_password else None,
                             requireAuthentication=email_starttls,
                             requireTransportSecurity=email_auth)