Unable to add pages when a vocabulary is set as required for pages - Backport of Story LPS-101409

• Type: Bug
• Status: In Review
• Resolution: Unresolved
• Affects Version/s: 7.1.X, 7.2.X
• Fix Version/s: None
• Component/s: WCM, WCM > Sites Management > Pages Administration
• Labels:
  • ee-7.2.x-only
  • ee-ts
• Fix Priority: 4
• Git Pull Request: https://github.com/liferay/liferay-portal-ee/pull/17714

Steps to reproduce issue:

1. Navigate to Site Administration > Content > Categories
2. Add a vocabulary with the following configurations
   • Provide a name
   • Under "Choose Asset Type", select "Page"
   • Flag the "Required" toggle switch
3. Add a category to the vocabulary
4. Navigate to Site Administration > Navigation > Site Pages
5. Click [ + ] to select the page type
6. Select any page type
7. Provide a page name
8. Click "Submit"

Actual result: Page validation message displays, "An unexpected error occurred."

The issue is fixed on the Story LPS-101409