Unable to remove/clear a virtual host value once set via Configuration - Site Settings page

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X EE, Master
• Fix Version/s: 7.0.0 DXP FP14, 7.0.0 DXP SP3, 7.0.3 CE GA4, 7.0.X EE, 7.1.X, Master
• Component/s: Sites Administration > Sites
• Labels:
  • liferay-digital-enterprise-70-sp3
  • liferay-fixpack-de-14-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Story Points: 1
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/48413

DESCRIPTION
I am unable to remove/clear a virtual host once set via Configuration - Site Settings page. I can only modify the values to something else. Setting is clearable once private page is deleted.
STEPS TO REPRODUCE
1) Start clean bundle
2) Create a Blank Site
3) Add Public page (Home) and Private page (Home-Private)
4) Go to Configuration->Site Settings, under Site URL, enter "somedns.test.com" for Private pages and Save
5) Try to clear the site URL for private pages
EXPECTED RESULTS
Setting is cleared
ACTUAL RESULTS
Setting is not cleared, but message says "Your request completed successfully"
BRANCH
Reproduced
7d94625398b35977f9c1a5cbf2b0b4dc9d84a5af
MASTER
Reproduced
2340bf972ad7381359fdc6df40e388d12c1daa52