Just a minor bug.
Workaround: don't check "Install Custom Tools" field if you don't use any tool.
Code changed in jenkins
User: Oleg Nenashev
Merge pull request #3 from synopsys-arc-oss/bugfix-npe-for-emty-toolslist
Fixed bug with NPE in case of empty tools list (JENKINS-18481)
Fixed issue in version 0.3