Skip sdkman.gradle if properties not available
MODIFY
asciidoctorj-distribution/build.gradle
asciidoctorj-distribution/build.gradle
apply plugin: 'application'
-if (project.statusIsRelease) {
+if (project.statusIsRelease && project.hasProperty("sdkman_consumer_key")) {
apply from: rootProject.file('gradle/sdkman.gradle')
}

Skip sdkman.gradle if properties not available