Remove defaults for required vars

roles/virtualization/templates/cloud-network-config.yml.j2

@@ -4,27 +4,27 @@ network:
     id0:
       match:
         macaddress: "{{ virtualization_mac_address }}"
-{% set has_static = vm_ip | length %}
-{% set dns_value = vm_dns %}
+{% set has_static = vm_ip is defined and vm_ip | length %}
+{% set dns_value = vm_dns if vm_dns is defined else '' %}
 {% set dns_list_raw = dns_value if dns_value is iterable and dns_value is not string else dns_value.split(',') %}
 {% set dns_list = dns_list_raw | map('trim') | reject('equalto', '') | list %}
-{% set search_value = vm_dns_search %}
+{% set search_value = vm_dns_search if vm_dns_search is defined else '' %}
 {% set search_list_raw = search_value if search_value is iterable and search_value is not string else search_value.split(',') %}
 {% set search_list = search_list_raw | map('trim') | reject('equalto', '') | list %}
 {% if has_static %}
       addresses:
         - "{{ vm_ip }}/{{ vm_nms }}"
-{% if vm_gw | length %}
+{% if vm_gw is defined and vm_gw | length %}
       gateway4: "{{ vm_gw }}"
 {% endif %}
 {% else %}
       dhcp4: true
-{% if (vm_dns | length) or (vm_dns_search | length) %}
+{% if (vm_dns is defined and vm_dns | length) or (vm_dns_search is defined and vm_dns_search | length) %}
       dhcp4-overrides:
-{% if vm_dns | length %}
+{% if vm_dns is defined and vm_dns | length %}
         use-dns: false
 {% endif %}
-{% if vm_dns_search | length %}
+{% if vm_dns_search is defined and vm_dns_search | length %}
         use-domains: false
 {% endif %}
 {% endif %}