feat(4D): Add 4D dynamic volume rendering and new pre-clinical 4d pt/ct mode (#3664)

Co-authored-by: Alireza <ar.sedghi@gmail.com>
Co-authored-by: Neil <neil.a.macphee@gmail.com>

extensions/default/src/init.ts

@@ -77,7 +77,7 @@ export default function init({ servicesManager, configuration = {}, commandsMana
   toolbarService.subscribe(toolbarService.EVENTS.TOOL_BAR_MODIFIED, state => {
     const { buttons } = state;
     for (const [id, button] of Object.entries(buttons)) {
-      const { groupId, items, listeners } = button.props;
+      const { groupId, items, listeners } = button.props || {};
 
       // Handle group items' listeners
       if (groupId && items) {