allow dynamic images for unset content type

MediaBrowser.Providers/Folders/DefaultImageProvider.cs

@@ -117,7 +117,7 @@ namespace MediaBrowser.Providers.Folders
             }
             if (string.IsNullOrWhiteSpace(viewType))
             {
-                return urlPrefix + "generic.jpg";
+                //return urlPrefix + "generic.jpg";
             }
 
             return null;

MediaBrowser.Server.Implementations/UserViews/DynamicImageProvider.cs

@@ -153,7 +153,8 @@ namespace MediaBrowser.Server.Implementations.UserViews
                 CollectionType.HomeVideos,
                 CollectionType.BoxSets,
                 CollectionType.Playlists,
-                CollectionType.Photos
+                CollectionType.Photos,
+                string.Empty
             };
 
             return collectionStripViewTypes.Contains(view.ViewType ?? string.Empty);