Fixed some broken tests

NzbDrone.Core.Test/MediaFileTests/MediaFileServiceTest.cs

@@ -33,7 +33,7 @@ namespace NzbDrone.Core.Test.MediaFileTests
         {
             var fakeSeries = Builder<Series>.CreateNew()
                 .With(s => s.Title = "30 Rock")
-                .With(s => s.RootFolder = new LazyLoaded<RootFolder>(new RootFolder { Path = @"C:\Test\TV" }))
+                .With(s => s.RootFolder = new LazyLoaded<RootFolder>(new RootFolder { Path = @"C:\Test" }))
                 .With(s => s.FolderName = "30 Rock")
                 .With(s => s.SeasonFolder = useSeasonFolder)
                 .Build();

NzbDrone.Core/Tv/Series.cs

@@ -53,7 +53,15 @@ namespace NzbDrone.Core.Tv
         //Todo: Use this to auto link RootFolder and Folder (using the proper path separator)
         public string Path
         {
-            get { return System.IO.Path.Combine(RootFolder.Value.Path, FolderName); }
+            get
+            {
+                if (RootFolder == null || RootFolder.Value == null || String.IsNullOrWhiteSpace(RootFolder.Value.Path))
+                {
+                    return null;
+                }
+
+                return System.IO.Path.Combine(RootFolder.Value.Path, FolderName);
+            }
         }
 
         //Todo: This should be a double since there are timezones that aren't on a full hour offset