Fix S3237: Rule should not throw NullReferenceException when using expression body accessor

[antrv]

Hello,

VS 15.5, SonarAnalyzer.CSharp 6.4 or 6.7

Analyzer 'SonarAnalyzer.Rules.CSharp.UseValueParameter' threw an exception of type 'System.NullReferenceException' with message 'Object reference not set to an instance of an object.'.
(Could not catch stack trace).

using System;

namespace ConsoleApp8
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, world!");
        }

        public Program(string id)
        {
            if (string.IsNullOrEmpty(id)) throw new ArgumentNullException(nameof(id));
        }

        private string id;

        public string Id
        {
            get => null;
            set => id = value;
        }
    }
}

[sm-g]

Have same issue very often from time to time when build solution (it succeed eventually after manual retry).