Can't create Knowledge Base articles

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.1.0 M2, 7.1.X, Master
• Component/s: Knowledge Base widget
• Labels: None
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/56181

Steps to reproduce:

1. Go to `Control Panel -> Knowledge Base`.
2. Click on the plus button and select `Basic Article`.

Expected: The creation page loads.
Actual: A blank page is displayed, printing the following exception to the logs:

java.lang.NullPointerException
	at com.liferay.knowledge.base.web.internal.util.AdminUtil.unescapeSections(AdminUtil.java:36)
	at org.apache.jsp.admin.common.edit_005farticle_jsp._jspService(edit_005farticle_jsp:590)