Fixed broken path tests

(cherry picked from commit 5a22afc42bb03c9cdfb0a46d470d084dbdd495d5)

src/NzbDrone.Windows/Disk/DiskProvider.cs

@@ -201,6 +201,11 @@ namespace NzbDrone.Windows.Disk
 
         private IMount GetReparsePoint(string path)
         {
+            if (!Directory.Exists(path))
+            {
+                return null;
+            }
+
             var di = new DirectoryInfo(path);
             var isReparsePoint = di.Attributes.HasFlag(FileAttributes.ReparsePoint);