build-coordinator/src/main/java/org/jboss/pnc/coordinator/builder/DefaultBuildCoordinator.java
private void checkForEmptyBuildSetTask(BuildSetTask buildSetTask) {
        if (buildSetTask.getBuildTasks() == null || buildSetTask.getBuildTasks().isEmpty()) {
            updateBuildSetTaskStatus(buildSetTask, BuildSetStatus.REJECTED, "Build config set is empty");
        }
    }
private void checkForEmptyBuildSetTask(BuildSetTask buildSetTask) {
        if (buildSetTask.getBuildTasks() == null || buildSetTask.getBuildTasks().isEmpty()) {
            updateBuildSetTaskStatus(buildSetTask, BuildSetStatus.REJECTED, "Build config set is empty");
        }
    }
Check if the given build set task is empty and update the status message appropriately