Errors aren't displayed when creating categories

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.0 CE M6
• Fix Version/s: 6.2.0 CE M6, 6.2.0 CE RC6
• Component/s: Categories, Frontend Infrastructure
• Labels:
  • QA-KC
  • QA-R
• Story Points: 2
• Fix Priority: 5
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/11787

1-Create category
2-Create subcategory
3-Create subcategory at same level as previous one, and with same name
4-No error is displayed, although the right error is sent from server:

exception: "class com.liferay.portlet.asset.DuplicateCategoryException:There is another category named cat1_8 as a child of category 10477"