Fix missing songs in categories

Vocaluxe/Base/CSongCategorizer.cs

@@ -71,7 +71,7 @@ namespace Vocaluxe.Base
             {
                 if (songPointer.SortString != "")
                 {
-                    if (lastCategory == null || songPointer.SortString != lastCategory.Name)
+                    if (lastCategory == null || String.Compare(songPointer.SortString, lastCategory.Name, StringComparison.CurrentCultureIgnoreCase) != 0)
                     {
                         lastCategory = new CCategory(songPointer.SortString);
                         _Categories.Add(lastCategory);

Vocaluxe/Base/CSongSorter.cs

@@ -155,7 +155,7 @@ namespace Vocaluxe.Base
                 list.Add(new CSongPointer(song.ID, value));
             else
             {
-                if (list.Count == 0)
+                if (values.Count == 0)
                     list.Add(new CSongPointer(song.ID, ""));
                 else
                     list.AddRange(values.Select(val => new CSongPointer(song.ID, val)));