[Piuparts-reports] problem with piuparts-slave detected

[piuparts master]

Either piuparts-slave hangs or is not running at all or wasn't started with ~piupartss/bin/slave_run - please investigate and take appropriate measures!

Traceback (most recent call last):
  File "../share/piuparts/piuparts-slave", line 576, in <module>
    main()
  File "../share/piuparts/piuparts-slave", line 566, in main
    test_count += section.run()
  File "../share/piuparts/piuparts-slave", line 336, in run
    test_package(self._config, package, packages_files)
  File "../share/piuparts/piuparts-slave", line 444, in test_package
    output.write("Executing: %s\n" % cmd)
NameError: global name 'cmd' is not defined