The sonar:sonar step will fail on a multimodule project where the top level has packaging of "pom"

You get an error like this:
Failed to execute goal org.codehaus.mojo:sonar-maven-plugin:2.6:sonar (default-cli) on project MyTopModuleName: Dependency-Check report does not exist. Please check property sonar.dependencyCheck.reportPath: dependency-check-report.xml