[AVM Module Issue]: Fails when no terraform changes and no identity defined

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Issue Type?

Bug

(Optional) Module Version

0.1.5

(Optional) Correlation Id

No response

Description

Minimal terraform config (for me tag configuration was required to achieve desired state as we have implemented tag inheritance using policies, but I guess you could skip that if that's not the case):

terraform {
  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "~> 3"
    }
  }
}

provider "azurerm" {
  features {}
}

locals {
  location = "swedencentral"
}

data "azurerm_subscription" "current" {}

module "naming" {
  source  = "Azure/naming/azurerm"
  version = "~> 0.4"
}

resource "azurerm_resource_group" "main" {
  location = local.location
  name     = module.naming.resource_group.name_unique

  tags = data.azurerm_subscription.current.tags
}

module "redis" {
  source  = "Azure/avm-res-cache-redis/azurerm"
  version = "~> 0.1"

  location            = azurerm_resource_group.main.location
  name                = module.naming.redis_cache.name_unique
  resource_group_name = azurerm_resource_group.main.name

  capacity         = 0
  enable_telemetry = false
  sku_name         = "Basic"
  tags             = azurerm_resource_group.main.tags
  zones            = null
}

terraform apply, first run: Success

`terraform applyplResult, second run: ╷ │ Error: Unsupported attribute │ │ on .terraform\modules\redis\outputs.tf line 25, in output "system_assigned_mi_principal_id": │ 25: value = jsondecode(data.azapi_resource.this.output).identity.principalId │ ├──────────────── │ │ data.azapi_resource.this.output is "{\"id\":\"/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/rg-g6lz/providers/Microsoft.Cache/Redis/redis-xxxx\",\"location\":\"Sweden Central\",\"name\":\"redis-xxxx\",\"properties\":{\"accessKeys\":null,\"enableNonSslPort\":false,\"hostName\":\"redis-g6lz.redis.cache.windows.net\",\"instances\":[{\"isMaster\":true,\"isPrimary\":true,\"sslPort\":15000}],\"linkedServers\":[],\"minimumTlsVersion\":\"1.2\",\"port\":6379,\"provisioningState\":\"Succeeded\",\"publicNetworkAccess\":\"Enabled\",\"redisConfiguration\":{\"maxclients\":\"256\",\"maxfragmentationmemory-reserved\":\"30\",\"maxmemory-delta\":\"30\",\"maxmemory-policy\":\"volatile-lru\",\"maxmemory-reserved\":\"30\",\"preferred-data-persistence-auth-method\":\"SAS\"},\"redisVersion\":\"6.0\",\"sku\":{\"capacity\":0,\"family\":\"C\",\"name\":\"Basic\"},\"sslPort\":6380,\"updateChannel\":\"Stable\"},\"tags\":{\"myTag\":\"myValue\"},\"type\":\"Microsoft.Cache/Redis\"}" │ │ This object does not have an attribute named "identity". ╵

I guess output.tf should not expect identity to be configured as it's optional.

Azure / terraform-azurerm-avm-res-cache-redis