[banshee] CoverArtSpec: remove some more comparisons against Unknown strings

[Andrés Aragoneses <aaragoneses src gnome org>]

commit 45c1662e08b8640decdbcf9a12f8c8b789ba07f1
Author: Andrés G. Aragoneses <knocte gmail com>
Date:   Thu Oct 10 00:29:26 2013 +0200

    CoverArtSpec: remove some more comparisons against Unknown strings
    
    The removal of these deprecated comparisons that was recently committed[1]
    missed the CoverArtSpec class, which is done now.
    
    [1] https://git.gnome.org/browse/banshee/commit/?id=896af90924d6803ef5197b6da1ed4f2f174c143d

 src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs |   16 +++-------------
 1 files changed, 3 insertions(+), 13 deletions(-)
---
diff --git a/src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs 
b/src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs
index 16cf854..0d81033 100644
--- a/src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs
+++ b/src/Core/Banshee.Core/Banshee.Base/CoverArtSpec.cs
@@ -83,12 +83,12 @@ namespace Banshee.Base
 
         public static string CreateArtistAlbumId (string artist, string album)
         {
-            if (IsAlbumUnknown (album)) {
+            if (String.IsNullOrEmpty (album)) {
                 // do not attempt to group unknown album tracks together
                 return null;
             }
 
-            if (IsArtistUnknown (artist)) {
+            if (String.IsNullOrEmpty (artist)) {
                 return null;
             }
 
@@ -110,16 +110,6 @@ namespace Banshee.Base
             Hyena.Log.DebugFormat ("Album artwork path set to {0}", root_path);
         }
 
-        static bool IsAlbumUnknown (string album)
-        {
-            return album == null || album == AlbumInfo.UnknownAlbumTitleUntranslated || album == 
AlbumInfo.UnknownAlbumTitle;
-        }
-
-        static bool IsArtistUnknown (string artist)
-        {
-            return artist == null || artist == ArtistInfo.UnknownArtistNameUntranslated || artist == 
ArtistInfo.UnknownArtistName;
-        }
-
         private static string root_path = Path.Combine (XdgBaseDirectorySpec.GetUserDirectory (
             "XDG_CACHE_HOME", ".cache"),  "media-art");
 
@@ -138,7 +128,7 @@ namespace Banshee.Base
 
         public static string CreateLegacyArtistAlbumId (string artist, string album)
         {
-            if (IsArtistUnknown (artist) || IsAlbumUnknown (album)) {
+            if (String.IsNullOrEmpty (artist) || String.IsNullOrEmpty (album)) {
                 return null;
             }