fix(Models): onLoad should check this.props.layoutSelectors method (#6307)

ref #6305

src/core/components/model-collapse.jsx

@@ -65,7 +65,7 @@ export default class ModelCollapse extends Component {
   }
 
   onLoad = (ref) => {
-    if(ref) {
+    if (ref && this.props.layoutSelectors) {
       const scrollToKey = this.props.layoutSelectors.getScrollToKey()
 
       if( Im.is(scrollToKey, this.props.specPath) ) this.toggleCollapsed()