Better reporting an NPE trying to use CLI command on a broken 1.509.3 installation.
java.lang.NullPointerException 
	at com.cloudbees.jenkins.support.SupportCommand.run(SupportCommand.java:83) 
	at hudson.cli.CLICommand.main(CLICommand.java:229) 
	at org.jenkinsci.main.modules.sshd.CLICommandAdapter$1.run(CLICommandAdapter.java:34) 
	at org.jenkinsci.main.modules.sshd.AsynchronousCommand$1.run(AsynchronousCommand.java:105) 
	at java.lang.Thread.run(Thread.java:722)