/// <summary>
        /// Sets the defaults values for tags which are empty or adds further information.
        /// </summary>
        /// <param name="model">The model.</param>
        /// <returns>The viewmodel.</returns>
        private void SetDefaultValues(MetaTagsViewModel model)
        {
            if (string.IsNullOrEmpty(model.Viewport))
            {
                model.Viewport = "width=device-width, initial-scale=1";
            }

            var currentPage = _pageHierarchyResolver.GetCurrentPage <PageDataBase>();

            if (string.IsNullOrEmpty(model.Description))
            {
                model.Description = currentPage.SubTitle;
            }

            if (string.IsNullOrEmpty(model.Keywords))
            {
                model.Keywords = currentPage.Category != null?string.Join(", ", currentPage.Category.Select(c => c.ToString())) : string.Empty;
            }

            if (string.IsNullOrEmpty(model.Date))
            {
                model.Date = currentPage.Changed.ToString("yyyy-MM-dd");
            }

            if (string.IsNullOrEmpty(model.Author))
            {
                model.Author = currentPage.ChangedBy;
            }
        }
        /// <summary>
        /// Index action of this block
        /// </summary>
        /// <param name="currentBlock">The current block.</param>
        /// <returns></returns>
        public override ActionResult Index(MetaTagsBlock currentBlock)
        {
            var model = new MetaTagsViewModel
            {
                Description = currentBlock.Description,
                Viewport    = currentBlock.Viewport,
                Keywords    = string.Join(", ", currentBlock.Keywords),
                Date        = currentBlock.Date.HasValue && currentBlock.Date != DateTime.MinValue ? currentBlock.Date.Value.ToString("yyyy-MM-dd") : string.Empty,
                Author      = currentBlock.Author
            };

            //Set defaults if values are not set
            SetDefaultValues(model);

            return(PartialView(model));
        }