Prevent parsing for Wdtv metadata detection if not a matching extension

src/NzbDrone.Core/Extras/Metadata/Consumers/Wdtv/WdtvMetadata.cs

@@ -53,6 +53,8 @@ namespace NzbDrone.Core.Extras.Metadata.Consumers.Wdtv
                 return null;
             }
 
+            if (Path.GetExtension(filename).ToLowerInvariant() == ".xml")
+            {
                 var metadata = new MetadataFile
                 {
                     ArtistId = artist.Id,
@@ -64,9 +66,6 @@ namespace NzbDrone.Core.Extras.Metadata.Consumers.Wdtv
 
                 if (parseResult != null)
                 {
-                switch (Path.GetExtension(filename).ToLowerInvariant())
-                {
-                    case ".xml":
                     metadata.Type = MetadataType.TrackMetadata;
                     return metadata;
                 }