sample_app - #27: Bug fixed Tags page allow to delete used tags
sample_app - #27: Bug fixed Tags page allow to delete used tags
sample_app - #28: adding used method to verify if any catalog item is in use
sample_app - #28: adding used method to verify if any catalog item is in use
sample_app - #28: avoid of button delete on catalogs
sample_app - #28: bug fixed catalogs allows to delete on used items
issues 27 and 28 fixed and merged into candidate4