News Plugin: No warning/error is displayed when user doesn't fill "date" & "Author" section and proceed creating new news item and publish it from CMS.

Reproduction steps:--
Prerequisite:--Essentials project should be build & created for the first time.

1.Go to essentials url "http://localhost:8080/essentials/"
2.Add a news plugin.
3.Rebuild the project
4.Go to CMS
5.Add new news item.
6.Give the title,save it and publish it.
7.The new news item is not displayed on website because user forgot to enter date and author value.
8.So either the "author" & "date" should be mandatory field and warning/error should be displayed if user forgets to give value and publish
OR the document should be displayed on website without requiring values for these fields.

Check screenshot for reference