if (cell is not null)
{
    return; // I guess ?
}

if (cell?.Pages.Count == 0)
{
    SpaceControl!.Root.Children!.Remove(cell);
}

// ...create a new cell and place at the end of the root collection
cell = new KryptonWorkspaceCell();
SpaceControl!.Root.Children!.Add(cell);

if (cell is not null)
{
    return; // I guess ?
}

if (cell?.Pages.Count == 0)
{
    SpaceControl!.Root.Children!.Remove(cell);
}

// ...create a new cell and place at the end of the root collection
cell = new KryptonWorkspaceCell();
SpaceControl!.Root.Children!.Add(cell);