Display the default TN if the object's TN is restricted.
Merge branch '7.x' of github.com:Islandora/islandora_solution_pack_collection into 7.x-restricted-thumbs
Don't need to grab the user here.
Merge pull request #81 from jordandukart/7.x-restricted-thumbs

Display the default TN if the object's TN is restricted.