Api restriction fix (#77)

* fix input restriction bug

* fix bug with null ip restriction

Co-authored-by: Tim Miller <tim.miller@risk.lexisnexis.com>

locals.tf

@@ -15,6 +15,8 @@ locals {
 
   windows_nodes = (length([for v in local.node_pools : v if lower(v.os_type) == "windows"]) > 0 ? true : false)
 
+  api_server_authorized_ip_ranges = (var.api_server_authorized_ip_ranges == null ? null : values(var.api_server_authorized_ip_ranges))
+
   invalid_node_pool_attributes = join(",", flatten([for np in values(var.node_pools) : [for k, v in np : k if !(contains(keys(var.node_pool_defaults), k))]]))
   validate_node_pool_attributes = (length(local.invalid_node_pool_attributes) > 0 ?
   file("ERROR: invalid node pool attribute:  ${local.invalid_node_pool_attributes}") : null)

main.tf

@@ -72,7 +72,7 @@ resource "azurerm_kubernetes_cluster" "aks" {
     }
   }
 
-  api_server_authorized_ip_ranges = values(var.api_server_authorized_ip_ranges)
+  api_server_authorized_ip_ranges = local.api_server_authorized_ip_ranges
 
   addon_profile {
     kube_dashboard {