Success message is missing after publishing image in Media Gallery

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.3.X, Master
• Fix Version/s: 7.4.1 CE GA2, 7.4.13 DXP GA1, Master
• Component/s: Media Gallery widget
• Labels: None
• Story Points: 1
• Fix Priority: 3
• Sprint: LIMA | QA Sprint 9
• Git Pull Request: https://github.com/liferay-lima/liferay-portal/pull/1901

Steps to reproduce:

1. Add a MG widget to page
2. Add an image through the widget. This is reproducible through single and multiple upload

Expected result:
When the image is added, a success message appears.

Actual result:
The image is added but no message appears.

Reproduced on:
Tomcat 9.0.37 + MySQL 5.7.
Portal master 9c07f7bca2bbde25a8cbcf2c84b6b311fb60e0f7
Portal 7.3 DXP SP1