update sortname generation

MediaBrowser.Controller/Entities/Audio/Audio.cs

@@ -131,7 +131,7 @@ namespace MediaBrowser.Controller.Entities.Audio
         /// Creates the name of the sort.
         /// </summary>
         /// <returns>System.String.</returns>
-        protected override string CreateSortName()
+        protected override string CreateSortNameInternal()
         {
             return (ParentIndexNumber != null ? ParentIndexNumber.Value.ToString("0000 - ") : "")
                     + (IndexNumber != null ? IndexNumber.Value.ToString("0000 - ") : "") + Name;

MediaBrowser.Controller/Entities/BaseItem.cs

@@ -689,14 +689,22 @@ namespace MediaBrowser.Controller.Entities
             return System.IO.Path.Combine(basePath, idString.Substring(0, 2), idString);
         }
 
+        protected string CreateSortName()
+        {
+            if (string.IsNullOrWhiteSpace(Name))
+            {
+                return null;
+            }
+
+            return CreateSortNameInternal();
+        }
+
         /// <summary>
         /// Creates the name of the sort.
         /// </summary>
         /// <returns>System.String.</returns>
-        protected virtual string CreateSortName()
+        protected virtual string CreateSortNameInternal()
         {
-            if (Name == null) return null; //some items may not have name filled in properly
-
             if (!EnableAlphaNumericSorting)
             {
                 return Name.TrimStart();

MediaBrowser.Controller/Entities/TV/Episode.cs

@@ -237,7 +237,7 @@ namespace MediaBrowser.Controller.Entities.TV
         /// Creates the name of the sort.
         /// </summary>
         /// <returns>System.String.</returns>
-        protected override string CreateSortName()
+        protected override string CreateSortNameInternal()
         {
             return (ParentIndexNumber != null ? ParentIndexNumber.Value.ToString("000 - ") : "")
                     + (IndexNumber != null ? IndexNumber.Value.ToString("0000 - ") : "") + Name;

MediaBrowser.Controller/Entities/TV/Season.cs

@@ -145,7 +145,7 @@ namespace MediaBrowser.Controller.Entities.TV
         /// Creates the name of the sort.
         /// </summary>
         /// <returns>System.String.</returns>
-        protected override string CreateSortName()
+        protected override string CreateSortNameInternal()
         {
             return IndexNumber != null ? IndexNumber.Value.ToString("0000") : Name;
         }

MediaBrowser.Controller/LiveTv/LiveTvChannel.cs

@@ -89,7 +89,7 @@ namespace MediaBrowser.Controller.LiveTv
             }
         }
 
-        protected override string CreateSortName()
+        protected override string CreateSortNameInternal()
         {
             if (!string.IsNullOrEmpty(Number))
             {