Navigation menu widget - Cannot re-select page hierarchy if its selected navigation menu is deleted and there are no other navigation menus

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.1.10 DXP FP5, 7.1.10.1 SP1, 7.1.2 CE GA3, 7.1.X, Master
• Component/s: Navigation Menus
• Labels:
  • liferay-dxp-71-sp1
  • liferay-fixpack-dxp-5-7110
• Branch Version/s:
  7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/64612

Reproduced on:
Tomcat 9.0.10 + MySQL 5.7. Portal master GIT ID: d4b82c11acc1d8990684c89ff0e964fcb1c97a91.

This is not reproducible on 7.1.x because 7.1.x will not allow there to be no navigation menus.

Steps to reproduce:

1. Go to Build > Navigation Menus and add a navigation menu
2. Go to the home page and configure the navigation menu widget to use that navigation menu
3. Go to Build > Navigation Menus and delete the navigation menu
4. Go to the home page and try to configure the navigation menu to use page hierarchy again

Expected result:
Either the user should be able to change it back to the page hierarchy or the navigation menu widget should default back to the page hierarchy in the absence of any navigation menus.

Actual result:
The user can't re-select page hierarchy and must create another dummy navigation menu in order change it back.