Refactor #719

src/components/datatable/DataTable.vue

@@ -1659,7 +1659,7 @@ export default {
             }
 
             children.forEach(child => {
-                if (child.dynamicChildren && child.dynamicChildren.length)
+                if (child.dynamicChildren && child.children instanceof Array)
                     cols = [...cols, ...child.children];
                 else if (child.type.name === 'column')
                     cols.push(child);