Allow empty -ForEach in type-accelerator tests (Pester 6 compat)

Pester 6 defaults Run.FailOnNullOrEmptyForEach to true, so the enum/class type-accelerator It blocks fail Discovery for a fixture module that has classes but no enums (or vice versa). Add -AllowNullOrEmptyForEach so an empty collection is skipped instead of failing the container. Fixes the Action-Test-outputs failure on main.

Author: MariusStorhaug

src/tests/Module/PSModule/PSModule.Tests.ps1

@@ -93,12 +93,12 @@ Describe 'PSModule - Module tests' {
         BeforeAll {
             Import-Module -Name $moduleManifestPath -Force
         }
-        It 'Should register public enum [<_>] as a type accelerator' -ForEach $expectedEnumNames {
+        It 'Should register public enum [<_>] as a type accelerator' -ForEach $expectedEnumNames -AllowNullOrEmptyForEach {
             $registered = [psobject].Assembly.GetType('System.Management.Automation.TypeAccelerators')::Get
             $registered.Keys | Should -Contain $_ -Because 'the framework registers public enums as type accelerators'
         }
 
-        It 'Should register public class [<_>] as a type accelerator' -ForEach $expectedClassNames {
+        It 'Should register public class [<_>] as a type accelerator' -ForEach $expectedClassNames -AllowNullOrEmptyForEach {
             $registered = [psobject].Assembly.GetType('System.Management.Automation.TypeAccelerators')::Get
             $registered.Keys | Should -Contain $_ -Because 'the framework registers public classes as type accelerators'
         }