修复新增分组时前端报错的BUG

src/components/panel/main/magic-resource.vue

@@ -268,6 +268,7 @@ const updateNode = (node, data) => {
 		}
 		const parentNode = node.parentId !== undefined && data.find(it => it.id === node.parentId)
 		if(parentNode){
+			parentNode.children = parentNode.children || []
 			parentNode.children.push(node)
 			return true
 		}