fix: #290 virtual network ourputs (#296)

locals.tf

@@ -24,9 +24,9 @@ locals {
 
   # virtual_networks_merged is a map of virtual networks created, if the module has been enabled.
   # This is used in the outputs.tf file to return the virtual network resource ids.
-  virtual_network_resource_ids = try(module.virtualnetwork[0].virtual_network_resource_ids, {})
+  virtual_network_resource_ids = var.virtual_network_enabled ? module.virtualnetwork[0].virtual_network_resource_ids : {}
 
   # resource_group_ids is a map of resource groups created, if the module has been enabled.
   # This is used in the outputs.tf file to return the resource group ids.
-  virtual_network_resource_group_ids = try(module.virtualnetwork[0].resource_group_ids, {})
+  virtual_network_resource_group_ids = var.virtual_network_enabled ? module.virtualnetwork[0].resource_group_ids : {}
 }