Drops empty lines

Jenkinsfile

@@ -1,28 +1,22 @@
 pipeline {
-
   agent {
     label 'ubuntu'
   }
-
   options {
     buildDiscarder logRotator(daysToKeepStr: '14', numToKeepStr: '10')
     timeout(80)
     disableConcurrentBuilds()
   }
-
   tools {
     jdk 'JDK 1.7 (latest)'
     maven 'Maven 3 (latest)'
   }
-
   triggers {
     pollSCM 'H/15 * * * *'
   }
-
   environment {
-    MAVEN_OPTS = "-Xmx1024m -XX:MaxPermSize=256m"
+    MAVEN_OPTS = '-Xmx1024m -XX:MaxPermSize=256m'
   }
-
   stages {
     stage('Build') {
       steps {