[sysadmin-bin] Make the error comment self explanatory

[Andrea Veri <averi src gnome org>]

commit bf626249d057b0d58e6cd145d5a4e6b4c4d72c2d
Author: Andrea Veri <averi redhat com>
Date:   Fri Mar 30 15:24:57 2018 +0200

    Make the error comment self explanatory

 letsencrypt/letsencrypt_dns_del.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/letsencrypt/letsencrypt_dns_del.sh b/letsencrypt/letsencrypt_dns_del.sh
index 30a4e76..fd8a449 100755
--- a/letsencrypt/letsencrypt_dns_del.sh
+++ b/letsencrypt/letsencrypt_dns_del.sh
@@ -24,7 +24,7 @@ if [ -d /tmp/dns ]; then
     if [[ -n "${ln}" ]]; then 
         sed -i "${ln}d" "master/${extracted_domain}"
     else
-        echo "The ln variable is empty"
+        echo "The DNS RR is missing, not cleaning anything up!" 
         rm -rf /tmp/dns
         exit 1
     fi