Fix bug in _viewer_item_by_id #504
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If multiple stack items were present and the first had children but not the requested viewer, then find_viewer_item would incorrectly return None instead of checking the next stack item.
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This fixes a bug in _viewer_item_by_id: if multiple stack items were present and the first had children but not the requested viewer, then find_viewer_item would incorrectly return None instead of checking the next stack item. I've also improved an error message related to finding viewers.