Traceback (most recent call last):
  File "/usr/bin/python-coverage", line 9, in <module>
    load_entry_point('coverage==3.6', 'console_scripts', 'coverage')()
  File "/usr/lib/python2.7/dist-packages/coverage/cmdline.py", line 710, in main
    status = CoverageScript().command_line(argv)
  File "/usr/lib/python2.7/dist-packages/coverage/cmdline.py", line 452, in command_line
    **report_args)
  File "/usr/lib/python2.7/dist-packages/coverage/control.py", line 615, in html_report
    return reporter.report(morfs)
  File "/usr/lib/python2.7/dist-packages/coverage/html.py", line 96, in report
    self.make_local_static_report_files()
  File "/usr/lib/python2.7/dist-packages/coverage/html.py", line 122, in make_local_static_report_files
    os.path.join(system_javascript.path, "jquery-tablesorter"),
NameError: global name 'system_javascript' is not defined