role 'odify-ipt-gateway': some minor changes.

roles/modify-ipt-gateway/tasks/main.yml

@@ -34,6 +34,8 @@
     path: /etc/ipt-firewall/main_ipv4.conf
     regexp: '^jitsi_tcp_ports='
     line: 'jitsi_tcp_ports="$standard_jitsi_tcp_ports"'
+  when: 
+    - main_ipv4_exists.stat.exists
   notify:
     - Restart IPv4 Firewall
 
@@ -52,6 +54,8 @@
     path: /etc/ipt-firewall/main_ipv4.conf
     regexp: '^jitsi_udp_ports='
     line: 'jitsi_udp_ports="$standard_jitsi_udp_port_range"'
+  when: 
+    - main_ipv4_exists.stat.exists
   notify:
     - Restart IPv4 Firewall
 
@@ -70,6 +74,8 @@
     path: /etc/ipt-firewall/main_ipv4.conf
     regexp: '^brscan_port='
     line: 'brscan_port="$standard_brother_brscan_port"'
+  when: 
+    - main_ipv4_exists.stat.exists
   notify:
     - Restart IPv4 Firewall