get rid of the stall with 'dhcp'

roles/network/tasks/sysd-netd-debian.yml

@@ -31,7 +31,12 @@
 - name: Static IP computing CIDR
   shell: netmask {{ wan_ip }}/{{ wan_netmask }} | awk -F "/" '{print $2}'
   register: CIDR
-  when: wan_ip != "dhcp" or gui_static_wan_ip == "undefined"
+  when: wan_ip != "dhcp"
+
+- name: Static IP setting CIDR
+  set_fact:
+    wan_cidr: "{{ CIDR.stdout }}"
+  when: wan_ip != "dhcp"
 
 # ICO will always set gui_static_wan_ip away from the default of 'unset' while
 # gui_static_wan turns dhcp on/off through wan_ip in computed_network and