prep for portable providers project

MediaBrowser.Providers/Music/FanArtAlbumProvider.cs

@@ -94,7 +94,7 @@ namespace MediaBrowser.Providers.Music
                 {
 
                 }
-                catch (DirectoryNotFoundException)
+                catch (IOException)
                 {
 
                 }

MediaBrowser.Providers/Music/FanArtArtistProvider.cs

@@ -98,7 +98,7 @@ namespace MediaBrowser.Providers.Music
                 {
 
                 }
-                catch (DirectoryNotFoundException)
+                catch (IOException)
                 {
 
                 }