Maven Resolver Jenkinsfile finished with null

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See https://builds.apache.org/job/maven-wip/job/maven-resolver/job/master/4/

Build succeeded in Jenkins: Maven TLP » maven-enforcer » BADGES #5

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See https://builds.apache.org/job/maven-box/job/maven-enforcer/job/BADGES/5/

Changes:

* Improved.
* Improved.
* Improved.
* Improved.
* Improved.

All tests passed

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Build failed in Jenkins: Maven TLP » maven-enforcer » BADGES #4

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O] Downloading from central: 
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[linux-jdk7] [INFO] Downloaded from central: 
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[Pipeline] [windows-jdk8] isUnix
[Pipeline] [windows-jdk8] bat
[windows-jdk8] [m] Running batch script
[Pipeline] [windows-jdk7] }
[Pipeline] [linux-jdk8] // stage
[Pipeline] [linux-jdk8] }
[Pipeline] [windows-jdk7] // dir
[linux-jdk9] [INFO] [jenkins-event-spy] Generate 
/home/jenkins/jenkins-slave/workspace/n-box_maven-enforcer_BADGES-3NDUY6QXR562DM7DE2VWZUQFNNGN5VMPZMMSHQHT52XV6TLZUBYQ@tmp/withMaven756b04d9/maven-spy-20180114-112856-70412766984260453875412.log.tmp
 ...
[linux-jdk9] [INFO] Scanning for projects...
[Pipeline] [windows-jdk7] }
[windows-jdk7] [withMaven] Skip 'Generated Artifacts Publisher' disabled by 
configuration
[windows-jdk7] [withMaven] Skip 'Findbugs Publisher' disabled by configuration
[windows-jdk7] [withMaven] Skip 'Open Task Scanner Publisher' disabled by 
configuration
[Pipeline] [linux-jdk8] // node
[Pipeline] [linux-jdk8] }
[linux-jdk8] Failed in branch linux-jdk8
[Pipeline] [windows-jdk7] // withMaven
[Pip