removed comma from windows invalid path chars.

NzbDrone.Common.Test/EnsureTest/PathExtensionFixture.cs

@@ -0,0 +1,19 @@
+using System;
+using FluentAssertions;
+using Moq;
+using NUnit.Framework;
+using NzbDrone.Common.EnsureThat;
+using NzbDrone.Test.Common;
+
+namespace NzbDrone.Common.Test.EnsureTest
+{
+    [TestFixture]
+    public class PathExtensionFixture : TestBase
+    {
+        [TestCase(@"p:\TV Shows\file with, comma.mkv")]
+        public void EnsureWindowsPath(string path)
+        {
+            Ensure.That(() => path).IsValidPath();
+        }
+    }
+}