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 %}

roles/virtualization/templates/vm.xml.j2

@@ -1,7 +1,7 @@
 <domain type='kvm'>
   <name>{{ hostname }}</name>
   <memory>{{ vm_memory | int * 1024 }}</memory>
-  {% if vm_ballo | int > 0 %}<currentMemory>{{ vm_ballo | int * 1024 }}</currentMemory>{% endif %}
+  {% if vm_ballo is defined and vm_ballo | int > 0 %}<currentMemory>{{ vm_ballo | int * 1024 }}</currentMemory>{% endif %}
   <vcpu placement='static'>{{ vm_cpus }}</vcpu>
   <os>
     <type arch='x86_64' machine="pc-q35-8.0">hvm</type>
@@ -37,7 +37,7 @@
       <source file="{{ virtualization_libvirt_cloudinit_path }}"/>
       <target dev="sdb" bus="sata"/>
     </disk>
-    {% if rhel_iso | length > 0 %}
+    {% if rhel_iso is defined and rhel_iso | length > 0 %}
     <disk type="file" device="cdrom">
       <driver name="qemu" type="raw"/>
       <source file="{{ rhel_iso }}"/>