Jump to page misbehaves when action is set before condition

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.1.0 Beta 1, 7.1.X, Master
• Component/s: Forms
• Labels:
  • Front-end-forms
  • forms_mission_1
  • fw_test_needed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/57454

Steps to reproduce

1. Go to Content > Forms
2. Add a Form
3. Add a text field named Text 1
4. Add a rule
5. Leave conditions blank for now
6. Add action: jump to page 1
7. Add condition now: if Text 1 is not empty

Expected result:
User should not be able to perform a jump to page when there's only one or two page. And this should be somehow explicit to him.

Actual result:
The page selector at the jump to page action gets blank, seeming like a bug.