fix: Avoid crashing when updated triggered before rendering

fix: Switch fix to safer place

Author: SylvainBigonneau

src/core/componentStructure.js

@@ -30,7 +30,7 @@ class ComponentStructure {
   updated() {
     const { defaultNodes, realList } = this;
     defaultNodes.forEach((node, index) => {
-      addContext(getHtmlElementFromNode(node), {
+      addContext(getHtmlElementFromNode(node) || {}, {
         element: realList[index],
         index
       });

src/vuedraggable.js

@@ -139,7 +139,7 @@ const draggableComponent = defineComponent({
   },
 
   updated() {
-    this.componentStructure.updated();
+    this.$nextTick(() => this.componentStructure.updated());
   },
 
   beforeUnmount() {