Eliminated exceptions when showing/modyfying "My page" containing custom queries.

I'm using this plugin and I'm getting following exceptions:
- when trying to display "My page" with custom queries:
```
"ActionController::RoutingError (No route matches {:action=>"", :controller=>"my"})"
```
- when trying to save "My page" settings for custom queries:
```
ActionController::RoutingError (No route matches [POST] "/my/page")
```

Problem does exist on:
 * Redmine version                2.4.5.stable
 * Ruby version                   1.9.3-p484 (2013-11-22) [x86_64-linux]
 * Rails version                  3.2.17