HTTP 400 error deploying a legacy war with display-name element removed

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, Master
• Fix Version/s: 7.0.0 DXP FP55, 7.0.0 DXP SP9, 7.0.X, 7.1.10 DXP FP1, 7.1.1 CE GA2, 7.1.10.1 SP1, 7.1.X, Master
• Component/s: App Management > Plugins Configuration
• Labels:
  • ee-ts
  • liferay-dxp-70-sp9
  • liferay-dxp-71-sp1
  • liferay-fixpack-de-55-7010
  • liferay-fixpack-dxp-1-7110
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Story Points: 0.25
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/61167

DESCRIPTION
Displaying a legacy WAR style portlet where the display-name was not set that users do not have permissions to see results in a HTTP 400 and the following on the page:

Internal Server Error
An error occurred while accessing the requested resource.

http://localhost:8080/web/guest/page

This is a regression issue that was introduced in DE-36 by a source formatting commit that was part of LPS-76512.

Please see https://issues.liferay.com/browse/LPP-30695?focusedCommentId=1399983 for further context
STEPS TO REPRODUCE
1. Deploy a legacy WAR style portlet that doesn't have a display-name element set in its portlet.xml (use attached plugin)
2. Add the portlet to a page.
3. Remove Guest view permissions from the portlet.
4. Visit the page as a Guest.
EXPECTED RESULTS
Page appears without error
ACTUAL RESULTS
Internal Server Error
An error occurred while accessing the requested resource.

http://localhost:8080/web/guest/test
and http 400 in browser console