UnusedTracker produces path may not be null or empty string. path='null' #425
Description
OpenJDK 11, Shadow 4.0.2, Gradle 4.10.2
Full stacktrace at https://scans.gradle.com/s/gubxbmanlcctc/failure?openFailures=WzBd&openStackTraces=WzEse31d#top=0 which contains the line at com.github.jengelman.gradle.plugins.shadow.internal.UnusedTracker$_getApiJarsFromProject_closure5.doCall(UnusedTracker.groovy:59).