MB site configuration doesn't save because of missing valid user ranks

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 DXP SP1, Master
• Fix Version/s: 7.0.0 DXP FP5, 7.0.0 DXP SP1, 7.0.3 CE GA4, 7.1.X, Master
• Component/s: Message Boards, ~ [Archived] Collaboration
• Labels:
  • QA-AUTOMATION
  • liferay-digital-enterprise-70-sp1
  • liferay-fixpack-de-5-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 5
• Sprint: Natroapophyllite
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/43476
• QA Test Name:
  • CPMessageboards#ViewAnonymousPostingAllowedCheckboxConfiguration
  • CPMessageboards#ViewBBCodeNoXSS
  • MessageboardsUsecase#ViewMBThreadAndReplyThreadInGmail
  • MessageboardsUsecase#ViewNoSubscribeLinksNoWithEmailNotificationsDisabled
  • MessageboardsUsecase#ViewThreadDefaultQuestion
• QA Test Score: 18

Steps to reproduce

1. Navigate to Site > Content > Message Boards
2. Go to Configuration
3. Make changes and click save

Expected result: Configuration gets saved and success message displays
Actual result: Configuration does not get saved. Two error messages display: Your request failed to complete and Please enter valid user ranks

Reproduced on:
Tomcat 8.0.32 + MySQL 5.6
Portal master GIT ID: 63c343358fdf2672d7499e3e2e51a8c4c9e22428
Portal ee-7.0.x GIT ID: 24a12851076edfed5998bd6456b7f267e80017aa