Not working if duration attribute is not present

[PMudra]

I have an ignored test class in my project like this:

using NUnit.Framework;

namespace SomeNamespace
{
  [Ignore]
  class Class1
  {
    [Test]
    public void Test1()
    {
    }
  }
}

When I run the tests I get a TestResult like this:

<UnitTestResult executionId="cb49743c-98b4-469a-b396-f075359b7093" testId="d9844934-2718-40fe-9f86-64ebc9e03a45" testName="Test1" computerName="MyMachine" startTime="2016-01-07T16:53:27.6797496+01:00" endTime="2016-01-07T16:53:27.6797496+01:00" testType="13cdc9d9-ddb5-4fa4-a97d-d965ccfc6d4b" outcome="NotExecuted" testListId="8c84fa94-04c1-424b-9868-57a2d4851a1d" relativeResultsDirectory="cb49743c-98b4-469a-b396-f075359b7093">
  <Output>
  </Output>
</UnitTestResult>

Since there is no duration attribute on this UnitTestResult element the method ToExactTimeDefinition(string duration) failes.