fixing NoMethodError in application_controller:

```
[FATAL 2013-08-29 15:22:24 app]
| NoMethodError (undefined method `total' for #<Array:0x00000007f73c38>):
|   app/controllers/application_controller.rb:590:in `render_panel_results'
|   app/controllers/subscriptions_controller.rb:104:in `items'
|   app/lib/util/thread_session.rb:111:in `thread_locals'
|   config/initializers/quiet_paths.rb:11:in `call_with_quiet'
|   lib/katello/middleware/log_request_uuid.rb:22:in `call'
|
|
```

/cc @jlsherrill