Nullable parameters for built-in types

[BernieWhite]

Existing rule

No response

Description of the issue

When nullable parameters are defined in a module and the consuming module does not pass through a value (resulting in a null) an expansion error is raised.

The problem is also experienced with custom types, however there is some additional complexity so a separate issue will track the case for custom types #2489.

Error messages

The parameter named 'minTLSVersion' was not set or a defaultValue was defined.

Reproduction

param minTLSVersion string?

resource storage 'Microsoft.Storage/storageAccounts@2023-01-01' = {
  name: 'test'
  #disable-next-line no-loc-expr-outside-params
  location: resourceGroup().location
  sku: {
    name: 'Standard_LRS'
  }
  kind: 'StorageV2'
  properties: {
    minimumTlsVersion: minTLSVersion ?? 'TLS1_2'
  }
}

Version of PSRule

2.9.0

Version of PSRule for Azure

1.30.2

Additional context

Raised by @AlexanderSehr in microsoft/PSRule#1640