Code review comment for lp://staging/~cprov/uci-engine/charm-tests

I keep getting the following trace on with and without a deployment. (both with novarc file sourced.)

Traceback (most recent call last):
  File "./run-tests", line 32, in <module>
    retval = run_tests.main(sys.argv[1:], sys.stdout, sys.stderr)
  File "/home/psivaa/temp/code-reviews/charm-tests/testing/run_tests.py", line 565, in main
    options.include_regexps, options.exclude_regexps)
  File "/home/psivaa/temp/code-reviews/charm-tests/testing/run_tests.py", line 448, in load_charm_tests
    suite.setCharmRoots()
  File "/home/psivaa/temp/code-reviews/charm-tests/testing/run_tests.py", line 356, in setCharmRoots
    s.charm_root = '/'.join(flat_tests[0].id().split('.')[:3])
IndexError: list index out of range

Marking the MP, needs fixing. Please feel free to ignore if i'm doing abs stupid :)