public void AddCategory(CategoryViewModel category)
{
category.Id = category.Id == Guid.Empty ? Guid.NewGuid() : category.Id;
category.CreateDate = category.CreateDate == DateTime.MinValue ? DateTime.Now : category.CreateDate;
category.Name = category.Name.IsEmpty() ? "Новая категория" : category.Name;
category.Order = category.Order == 0
? (_storageDb.GetCategoryChildrenCount(category.ParentId) + 1)
: category.Order;
_storageDb.AddCategory(category);
}