Currently when an admin tries to edit an no-existing enterprise, a
NoMethodError is raised.
This commit adds a set_enterprise setter method to the
enterprises controller that sets the @enterprise instance variable to
have the same value as the enterprise object defined in the the edit
method; this method also rescues the NotFound error in case
the enterprise is not found and redirects the user to the enterprises
index page with a error message.
5b3bae85ca