Message Board messages are not listed as an "Associated Asset Type" when creating a Vocabulary

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.3.X, Master
• Fix Version/s: 7.3.X, Master
• Component/s: Categories, Message Boards
• Labels: None
• Branch Version/s:
  7.3.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 3
• Sprint: LIMA | QA Sprint 2
• Git Pull Request: https://github.com/liferay-lima/liferay-portal/pull/1051

When creating a new Vocabulary in Site Administration > Categorization > Categories and selecting an "Associated Asset Type", MB messages are not listed as an option. This should not be the case considering LPS-108886, which enabled MB threads to be associated with a Category.

This ticket was created in response to PTR-2051. Note that this ticket should not be backported to 7.2.x or previous versions.

Reproduction Steps

1. Start up Liferay.
2. Navigate to Site Administration > Categorization > Categories, then click "+" to "Add Vocabulary".
3. Expand the "Associated Asset Types" tab, then click the "Choose Asset Type" dropdown menu to examine available types.
4. Observe that there are no available types related to Message Boards.

Actual:
There is no option for MB messages.

Expected:
There is an option for MB messages. After creating a Vocabulary for MB messages, it should be listed under the "Categorization" tab when creating/editing a MB thread.

Reproduced On

• master: 2e4a0669ac5684ab
• 7.3.x: b86b73ecac571c8c