using System;

public class Program

{

    public static void Main()

    {

        ReportVersion currentReportVersion1 = null;

        var currentReportVersion2 = new ReportVersion()

        {

            Properties = null

        };

        var currentReportVersion3 = new ReportVersion()

        {

            Properties = "{}"

        };

        var currentReportVersion4 = new ReportVersion()

        {

            Properties = "other"

        };

        Console.WriteLine(currentReportVersion1 is { Properties: "{}" or null });

        Console.WriteLine(currentReportVersion2 is { Properties: "{}" or null });

        Console.WriteLine(currentReportVersion3 is { Properties: "{}" or null });

        Console.WriteLine(currentReportVersion4 is { Properties: "{}" or null });

    }

    public class ReportVersion {

        public string Properties {get;set;}

    }

}