@Override
		public void archiveClosed(Archive archive) {
			if (!isLoaded()) {
				return;
			}
			List<GTreeNode> allChildrenList = getChildren();
			for (GTreeNode node : allChildrenList) {
				ArchiveNode archiveNode = (ArchiveNode) node;
				if (archive == archiveNode.getArchive()) {
					removeNode(archiveNode);
					archiveNode.dispose();
					return;
				}
			}
		}
This implementation returns null, since this class is the root of the hierarchy and does
not have an archive.
@see ghidra.app.plugin.core.datamgr.tree.DataTypeTreeNode#getArchiveNode()
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/tree/ArchiveRootNode.java