Show description in text emails only for the "going down" notifications, and only if the description is not empty.

templates/emails/alert-body-text.html

@@ -1,13 +1,12 @@
 {% load hc_extras %}
 The check "{{ check.name_then_code }}" has gone {{ check.status }}.
-
+{% if check.status == "down" and check.desc %}
 Additional notes:
 {{ check.desc }}
-
+{% endif %}
 More information:
 {{ check.details_url }}
 
-
 --
 Regards,
 {% site_name %}