@Override
		public void archiveStateChanged(Archive archive) {
			ArchiveNode archiveNode = getArchiveNode(archive);
			if (archiveNode != null) {
				archiveNode.archiveStateChanged();
			}
		}
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