NullPointerException in Revision.containsBranchName with Gerrit Trigger choosing strategy and build any branch

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      Job is configured to use Git with Gerrit Trigger choosing strategy. Remote name is gerrit, refspec is: +refs/heads/:refs/remotes/gerrit/ $GERRIT_REFSPEC. Configured to merge with $GERRIT_BRANCH and calculate changelog against $GERRIT_BRANCH.

      When using the Gerrit Trigger choosing strategy, "branches to build" is meaningless, so I left it at the default "**". However that causes the following NPE.

      Changing the "branches to build" to a valid branch name like "master" fixes the problem.

      Retriggered by user dcallagh for Gerrit: http://gerrit.beaker-project.org/4092 in silent mode.
[EnvInject] - Loading node environment variables.
Building in workspace /var/lib/jenkins/jobs/restraint-review-checks/workspace
selected Git installation does not exists. Using Default
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.gerrit.url ssh://jenkins@gerrit.beaker-project.org:29418/restraint # timeout=10
Fetching upstream changes from ssh://jenkins@gerrit.beaker-project.org:29418/restraint
 > git --version # timeout=10
using GIT_SSH to set credentials 
 > git -c core.askpass=true fetch --tags --progress ssh://jenkins@gerrit.beaker-project.org:29418/restraint +refs/heads/*:refs/remotes/gerrit/* refs/changes/92/4092/1
 > git rev-parse 918d97ecf9cf9fac9ff26a15531e975bde64f4ed^{commit} # timeout=10
FATAL: null
java.lang.NullPointerException
	at hudson.plugins.git.Revision.containsBranchName(Revision.java:104)
	at hudson.plugins.git.extensions.impl.PreBuildMerge.decorateRevisionToBuild(PreBuildMerge.java:57)
	at hudson.plugins.git.GitSCM.determineRevisionToBuild(GitSCM.java:925)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1017)
	at hudson.scm.SCM.checkout(SCM.java:484)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:1270)
	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:609)
	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:531)
	at hudson.model.Run.execute(Run.java:1751)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:89)
	at hudson.model.Executor.run(Executor.java:240)
Finished: FAILURE

            Assignee:
            rsandell
            Reporter:
            Dan C
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Archived: