ComboServlet miss-calculates CSS url() paths when aggregating files

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.0 CE RC2
• Fix Version/s: 6.2.0 CE RC1
• Component/s: Legacy Components, Legacy Components > API
• Labels: None
• Fix Priority: 5
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/13931

As you see in the screenshot sort-arrow-sprite returns 400, because ComboServlet detects no path sets (see around line #100) and hence return 400.
This still does not mean that image does not exist.