Selecting reCAPTCHA within system settings does not save without entering api keys

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.2 CE GA3, 7.1.10 DXP FP8, 7.1.X, Master
• Fix Version/s: 7.1.10 DXP FP13, 7.1.X, 7.2.0 GA1
• Component/s: Application Security > Captcha, Portal Configuration > System Settings
• Labels:
  • QA-V
  • SMEQAFP3
  • liferay-fixpack-dxp-13-7110
  • sme-must-7.2
• Branch Version/s:
  7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/72973

Steps to reproduce:

1. Navigate to Control Panel > Configuration > System Settings > Security Tools > CAPTCHA
2. Change the CAPTCHA Engine to reCAPTCHA
3. Leave the "reCAPTCHA Public Key" and "reCAPTCHA Private Key" fields empty
4. Save

Expected results:
A success alert pops up. The changes save. The user stays on the CAPTCHA system settings page.
OR if not being able to save without the key fields being populated is intended behavior, a failure message should appear.

Actual results:
The user is navigated back to the system settings home page. The product menu is missing. None of settings just changed are saved.

Notes:
This doesn't happen when the reCAPTCHA key fields are populated.

Reproduced on:
Portal master Git SHA: 8cafb3b502fa72946f6f0e080562db9fd39ea69a