Build failed in Jenkins: cloudstack-apidocs-master #3223

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See <https://builds.apache.org/job/cloudstack-apidocs-master/3223/display/redirect?page=changes>

Changes:

[rohit.yadav] server: Prevent NullPointer on a network with removed IP ranges/"VLANs"

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Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on H48 (ubuntu bionic) in workspace <https://builds.apache.org/job/cloudstack-apidocs-master/ws/>
No credentials specified
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://git-wip-us.apache.org/repos/asf/cloudstack.git # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/cloudstack.git
 > git --version # timeout=10
 > git fetch --tags --progress https://git-wip-us.apache.org/repos/asf/cloudstack.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse origin/master^{commit} # timeout=10
Checking out Revision d7aa0a2718381fcf57fc1f9df8296a4478d31d00 (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f d7aa0a2718381fcf57fc1f9df8296a4478d31d00
Commit message: "server: Prevent NullPointer on a network with removed IP ranges/"VLANs" (#3551)"
 > git rev-list --no-walk b576972f7104688cb945a4f8b6f6b36f50f790fb # timeout=10
ERROR: Maven Home /home/jenkins/tools/maven/apache-maven-3.0.4 doesnt exist
Archiving artifacts

Jenkins build is back to normal : cloudstack-apidocs-master #3224

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See <https://builds.apache.org/job/cloudstack-apidocs-master/3224/display/redirect?page=changes>