title: SonarQube Scanner analysis skipped in travis CI
body: <hr>
  
  <p>Does anyone knows for which reasons a SonarQube Scanner analysis could be skipped ?</p>
  
  <pre><code>$ sonar-scanner -X -Dsonar.host.url=https://sonarqube.com -Dsonar.login=$SONAR_TOKEN
  08:59:10.162 INFO: Scanner configuration file: /home/travis/.sonarscanner/sonar-scanner-2.8/conf/sonar-scanner.properties
  08:59:10.166 INFO: Project root configuration file: /home/travis/build/armadito/glpi/plugins/armadito/sonar-project.properties
  08:59:10.182 INFO: SonarQube Scanner analysis skipped
  The command "sonar-scanner -e -X -Dsonar.host.url=https://sonarqube.com -Dsonar.login=$SONAR_TOKEN" exited with 0.
  </code></pre>