Git plugin fails with NPE (Jenkins 1.502, 1.503)

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      Git plugin fails with NPE after upgrade to Jenkins 1.502 / Git Plugin 1.2.0.
      This could not be solved by upgrading to 1.503.

      Started by user ****
Building remotely on **** in workspace ****
Checkout:**** / **** - hudson.remoting.Channel@d5ba3a:****
Using strategy: Default
FATAL: null
java.lang.NullPointerException
	at hudson.plugins.git.GitSCM.getGitExe(GitSCM.java:839)
	at hudson.plugins.git.GitSCM.getGitExe(GitSCM.java:829)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1100)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:1342)
	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:683)
	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:588)
	at hudson.model.Run.execute(Run.java:1567)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:237)

      I tried with older versions of git plugin:

      Git Plugin version Cause Code
      1.2.0 NPE GitSCM.java:839
      1.1.29 IllegalAccessError GitSCM.java:940
      1.1.27 ClassCastException GitSCM.java:1370
      1.1.26 NPE GitSCM.java:875
      1.1.25 NPE GitSCM.java:867
      1.1.24 NPE GitSCM.java:871
      1.1.23 NPE GitSCM.java:993
      1.1.22 NPE GitSCM.java:935

      https://github.com/jenkinsci/git-plugin/blob/git-1.2.0/src/main/java/hudson/plugins/git/GitSCM.java#L839

      I'm not yet tried to attach any debugger, but it looks like Jenkins returns no git tool installations to the plugin.
      Configuration seems correct, at least same setting worked with previous Jenkins 1.498 / git plugin 1.1.25.

      <?xml version='1.0' encoding='UTF-8'?>
<hudson.plugins.git.GitTool_-DescriptorImpl plugin="git-client@1.0.3">
  <installations class="hudson.plugins.git.GitTool-array">
    <hudson.plugins.git.GitTool>
      <name>Default</name>
      <home>/usr/bin/git</home>
    </hudson.plugins.git.GitTool>
  </installations>
</hudson.plugins.git.GitTool_-DescriptorImpl>

            Assignee:
            Nicolas De Loof
            Reporter:
            Takayuki Okazaki
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Resolved:
              Archived: