Bad response and Trail issues in StatisticsTransformer

Firstly when you access the statistics page of an item that doesn't exist you see the statistics of the site instead of showing a 404 page.
For example: http://digital.cic.gba.gob.ar/handle/123456789/9999999/statistics

Secondly when you are watching the statistics of an item, the trail will be: /home/community/collection/statistics. Where "statistics" anchor references to the item's page.
I think the trail should be: /home/community/collection/item/Statistics , where "item" anchor references to the item and statistics has no target.

If you want I can make a Pull request, just tell me if it should be against 5.X branch or master.