fix query by multiple ids

MediaBrowser.Server.Implementations/Channels/ChannelPostScanTask.cs

@@ -55,7 +55,7 @@ namespace MediaBrowser.Server.Implementations.Channels
             }
 
             await CleanDatabase(cancellationToken).ConfigureAwait(false);
-            
+
             progress.Report(100);
         }
 
@@ -167,10 +167,14 @@ namespace MediaBrowser.Server.Implementations.Channels
         {
             var item = _libraryManager.GetItemById(id);
 
+            if (item == null)
+            {
+                return Task.FromResult(true);
+            }
+
             return _libraryManager.DeleteItem(item, new DeleteOptions
             {
                 DeleteFileLocation = false
-
             });
         }
 

MediaBrowser.Server.Implementations/Library/LibraryManager.cs

@@ -369,9 +369,14 @@ namespace MediaBrowser.Server.Implementations.Library
 
         public async Task DeleteItem(BaseItem item, DeleteOptions options)
         {
+            if (item == null)
+            {
+                throw new ArgumentNullException("item");
+            }
+
             _logger.Debug("Deleting item, Type: {0}, Name: {1}, Path: {2}, Id: {3}",
                 item.GetType().Name,
-                item.Name,
+                item.Name ?? "Unknown name",
                 item.Path ?? string.Empty,
                 item.Id);