firewall_pleroma_rejects.sh: Only return IP if no error occured.

firewall_pleroma_rejects.sh

@@ -4,7 +4,7 @@
 # BE CAREFUL: Some instances may run under a shared IP, you may block more than
 # you want. Watch out for timeouts in the logs. No warranties and so on.
 
-# Version: 2019-10-09_1
+# Version: 2019-10-25_1
 
 # You can modify the ignore-list in
 # "${XDG_CONFIG_HOME}/firewall_pleroma_rejects/ignorelist.user",
@@ -45,7 +45,7 @@ function get_ips()              # Outputs IPs, separated by newline.
 
     for ip_version in AAAA A; do
         for ip in $(dig +short "${domain}" "${ip_version}"); do
-            echo "${ip}"
+            [[ "${?}" -eq 0 ]] && echo "${ip}"
         done
     done
 }