traceback in tests with improper cr_... file

Long ago I started on a cr_tests_real.py file, but it has been superseded. However, it is still in my filesystem and not committed to bzr. With it in place and recent commits to click-reviewers-tools, the tests fail with (includes debugging print statement):

test_number_of_available_review_classes (test_modules.TestModules) ... [('ClickReviewContentHub', <class 'cr_content_hub.ClickReviewContentHub'>)]
[('ClickReviewDesktop', <class 'cr_desktop.ClickReviewDesktop'>)]
[('ClickReviewFunctional', <class 'cr_functional.ClickReviewFunctional'>)]
[('ClickReviewLint', <class 'cr_lint.ClickReviewLint'>)]
[('ClickReviewAccounts', <class 'cr_online_accounts.ClickReviewAccounts'>)]
[('ClickReviewPushHelper', <class 'cr_push_helper.ClickReviewPushHelper'>)]
[('ClickReviewScope', <class 'cr_scope.ClickReviewScope'>)]
[('ClickReviewSecurity', <class 'cr_security.ClickReviewSecurity'>)]
[]
ERROR
...
======================================================================
ERROR: test_number_of_available_review_classes (test_modules.TestModules)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/jamie/bzr-pulls/click-reviewers-tools/clickreviews/tests/test_modules.py", line 26, in test_number_of_available_review_classes
    review = modules.find_main_class(module_name)
  File "/home/jamie/bzr-pulls/click-reviewers-tools/clickreviews/modules.py", line 56, in find_main_class
    init_object = getattr(module, main_class[0][0])
IndexError: list index out of range

----------------------------------------------------------------------
Ran 229 tests in 0.724s

FAILED (errors=1)

Now, I could just remove the file, but I think modules.py should probably be more resilient-- especially when considering people trying to develop new checks, etc so as not to cause any confusion. Problematic file attached.