UI does not display error messages for staging in 6.1.x

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.X EE
• Fix Version/s: 6.1.X EE
• Component/s: Staging
• Labels:
  • QA-TP
• Branch Version/s:
  6.1.x
• Backported to Branch:
  Committed
• Story Points: 4
• Fix Priority: 3
• Git Pull Request: https://github.com/matethurzo/liferay-portal-ee/pull/112

1) start up portal and create two sites "staging" and "live"
2) configure "staging" to stage to "live
3) create a page for "staging" and add some content
4) go to the page and click on publish to remote live
5) go to the "remote live connections settings" tab and type in a wrong groupId
6) publish and confirm the publish dialog

expected behavior: error message should show up
actual behavior: no error message is shown and the current page is shown in the iFrame instead.

issue only exists in 6.1.x but the code that causes the issue was removed by LPS-50559