When not using predefined RSS feeds, single URL RSS feeds do not work

[markmclaren]

Describe the bug
Single URL RSS feeds do not work in uPortal-start/uPortal. NewsReader.cpd.xml refers to a portlet named "single-feed-news". I believe the "single-feed-news" portlet was removed in version 4.0.0 of NewsReaderPortlet.

To Reproduce

1. Goto Adminstrator dashboard/Portlet Adminstration.
2. Click on 'Register New Portlet'
3. Choose RSS - Newsfeed
4. Supply Portlet Title etc. In "Advanced Options" add the URL to a working valid RSS feed.
5. Attempt to add new RSS portlet to layout, via "Customize" - Nothing happens

Expected behavior
I would expect a portlet channel to be added displaying links to news based on the RSS feed configured.

Stacktrace
Stacktrace Includes:
org.apache.pluto.container.PortletContainerException: Unable to retrieve portlet: '/NewsReaderPortlet/single-feed-news'
Platform:

• uPortal Version: uPortal 5.11.0
• OS: Windows 10
• Browser: Chrome

Additional context
Tested using uPortal-start (5.0.0-SNAPSHOT). At time of writing this, uPortal-start uses newsReaderPortletVersion 5.0.4 and uPortalVersion 5.11.0.