EXOATPBuiltInProtectionRule/EXOEOPProtectionRule: Test doesn't work if properties are empty

[ricmestre]

Description of the issue

Some of the properties used in EXOATPBuiltInProtectionRule/EXOEOPProtectionRule are set as arrays in DSC, where you can define them as empty but EXO stores that information as simple null strings so even though the deployment works when calling Test-DscConfiguration the test fails because it compares $null to @()

I have a simple fix for both of them which I'll open a PR for.

Microsoft 365 DSC Version

1.24.1106.3

Which workloads are affected

Exchange Online

The DSC configuration

EXOATPBuiltInProtectionRule "EXOATPBuiltInProtectionRule-ATP Built-In Protection Rule"
        {
            Credential                = $Credscredential;
            Identity                  = "ATP Built-In Protection Rule";
            ExceptIfRecipientDomainIs = @();
        }
        EXOEOPProtectionPolicyRule "EXOEOPProtectionPolicyRule-Strict Preset Security Policy"
        {
            Credential                = $Credscredential;
            Ensure                    = "Present";
            ExceptIfRecipientDomainIs = @();
            Identity                  = "Strict Preset Security Policy";
            Name                      = "Strict Preset Security Policy";
            Priority                  = 0;
            State                     = "Enabled";
        }

Verbose logs showing the problem

N/A

Environment Information + PowerShell Version

Win11/PS5.1