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0% branch coverage when code has no branches

See original GitHub issue

Hi,

Small issue I noticed while playing around with Coverlet is that for code with no branches, 0% branch coverage is reported instead of 100%.

ConsoleApp1.csproj Program.cs

using System;

namespace ConsoleApp1
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }
    }
}

ConsoleApp1.Tests.csproj UnitTest1.cs

using System;
using Xunit;

namespace ConsoleApp1.Tests
{
    public class UnitTest1
    {
        [Fact]
        public void Test1()
        {
            Program.Main(new string[] { });
        }
    }
}

Output

Test run for C:\src\ConsoleApp1\ConsoleApp1.Tests\bin\Debug\netcoreapp2.1\Consol
eApp1.Tests.dll(.NETCoreApp,Version=v2.1)
Microsoft (R) Test Execution Command Line Tool Version 15.9.0
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...

Total tests: 1. Passed: 1. Failed: 0. Skipped: 0.
Test Run Successful.
Test execution time: 1.7762 Seconds

Calculating coverage result...
  Generating report 'C:\src\ConsoleApp1\ConsoleApp1.Tests\coverage.opencover.xml
'

+-------------+--------+--------+--------+
| Module      | Line   | Branch | Method |
+-------------+--------+--------+--------+
| ConsoleApp1 | 100%   | 0%     | 100%   |
+-------------+--------+--------+--------+

Total Line: 100%
Total Branch: 0%
Total Method: 100%

Thanks!