Friendly URL should not be a required field when adding a KB Article

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 M3
• Fix Version/s: 6.2.X EE, 7.0.0 M2
• Component/s: Knowledge Base widget
• Labels: None
• Branch Version/s:
  6.2.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-plugins-ee/pull/9333

When adding a new article and the Friendly URL field is not populated, you get the following portlet error message.

Your request failed to complete. 

Please enter a friendly URL that starts with a slash and contains alphanumeric characters, dashes, and underscores. 

Expected result:
If no Friendly URL is populated, the URL should be generated from the title

Actual result:
If no Friendly URL is populated, a portlet error is thrown.