Usability improvement if content for announcement is empty

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 DXP SP2
• Fix Version/s: 7.0.0 DXP FP10, 7.0.0 DXP SP2, 7.0.3 CE GA4
• Component/s: Announcements & Alerts widgets, ~ [Archived] Collaboration
• Labels:
  • liferay-digital-enterprise-70-sp2
  • liferay-fixpack-de-10-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 3
• Sprint: Tetraferriphlogopite 12/20-1/3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal-ee/pull/15513

Steps to reproduce

1. Add an Alerts or Announcements portlet.
2. Create a new alert or announcement
3. Leave the content field empty
4. Save

Observed: Only one message appears, 'Your request failed to complete'.
Expected: A second message, 'Please enter valid content', should appear following the pattern of the Blogs portlet.

Note: In the branch master the code has been refactored and the problem is not reproduced.
master LPS-67019 -> LPS-67116