[banshee] --query-X option sometimes returned an error (bgo#591291)

[Alexander Kojevnikov <alexk src gnome org>]

commit e59396eba55eac5b8755587efc3059a7c4e43e8d
Author: Alexander Kojevnikov <alexander kojevnikov com>
Date:   Thu Aug 13 08:52:17 2009 +1000

    --query-X option sometimes returned an error (bgo#591291)
    
    If the currently playing song had and empty value, querying for it
    produced - Error: 'X' field unknown.
    
    This commit returns an empty string if the currently playing song
    has no value set for the field being queried.

 src/Clients/Halie/Halie/Client.cs |   23 ++++++++++++++++-------
 1 files changed, 16 insertions(+), 7 deletions(-)
---
diff --git a/src/Clients/Halie/Halie/Client.cs b/src/Clients/Halie/Halie/Client.cs
index 8b1a071..47b110d 100644
--- a/src/Clients/Halie/Halie/Client.cs
+++ b/src/Clients/Halie/Halie/Client.cs
@@ -204,17 +204,26 @@ namespace Halie
                 case "can-seek":
                     DisplayTrackField ("can-seek", player.CanSeek);
                     break;
-                default:
+                case "URI":
+                case "artist":
+                case "album":
+                case "name":
+                case "length":
+                case "track-number":
+                case "track-count":
+                case "disc":
+                case "year":
+                case "rating":
+                case "score":
+                case "bit-rate":
                     if (track == null) {
                         Error ("not playing");
                         break;
                     }
-                    
-                    if (track.ContainsKey (query)) {
-                        DisplayTrackField (query, track[query]);
-                    } else {
-                        Error ("'{0}' field unknown", query);
-                    }
+                    DisplayTrackField (query, track.ContainsKey (query) ? track[query] : "");
+                    break;
+                default:
+                    Error ("'{0}' field unknown", query);
                     break;
             }
         }