Can not create Site with required Vocabulary

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.3.X, Master
• Fix Version/s: 7.3.X, 7.4.3.7 CE GA7, 7.4.13 DXP U3, Master
• Component/s: Asset Framework, Categories, Sites Administration > Sites
• Labels:
  • ee-ts
  • liferay-fixpack-dxp-4-7310
  • liferay-update-dxp-3-7413
  • liferay-update-dxp-4-7310
  • pt-app-security-review
• Branch Version/s:
  7.3.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Git Pull Request: https://github.com/liferay-echo/liferay-portal/pull/6850

Reproduction steps

1. Open the menu on the upper right and select the Global Site
2. Go to Categorization --> Categories and create a Vocabulary with Associated Asset Types set to "Site" and "Required"
3. Add a Category to this Vocabulary
4. Go to Control Panel --> Sites --> Sites and try to create a new Site then save

Expected behaviour: A category selector is present for each required vocabulary on the create Site modal

Actual behaviour: The Site is not created. “An expected error occurred" appears in the UI, and the following error appears in the log:
ERROR [http-nio-8080-exec-1][GroupExceptionRequestHandler:89] null