made user_data node variables non-nullable

Author: wtripp180901

environments/site/tofu/node_group/variables.tf

@@ -203,18 +203,13 @@ variable "config_drive" {
 }
 
 variable "additional_cloud_config" {
-    description = <<-EOT
-        Multiline string to be appended to the node's cloud-init cloud-config user-data.
-        Must be in yaml format and not include the #cloud-config or any other user-data headers.
-        See https://cloudinit.readthedocs.io/en/latest/explanation/format.html#cloud-config-data.
-        Can be a templatestring parameterised by `additional_cloud_config_vars`
-    EOT
     type = string
     default = ""
+    nullable = false
 }
 
 variable "additional_cloud_config_vars" {
-    description = "Map of values passed to the `additional_cloud_config` templatestring"
     type = map(any)
     default = {}
+    nullable = false
 }