firewall_pleroma_rejects.sh: Only generate rule if IP is found.

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: 2019-08-15_1
+# Version: 2019-10-09_1
 
 # You can modify the ignore-list in
 # "${XDG_CONFIG_HOME}/firewall_pleroma_rejects/ignorelist.user",
@@ -170,7 +170,7 @@ function main()
 
     for domain in $(get_domains "${instance}"); do
         for ip in $(get_ips "${domain}"); do
-            gen_rule "${ip}" "${domain}"
+            [[ -n "${ip}" ]] && gen_rule "${ip}" "${domain}"
         done
     done