Code review comment for ~ilasc/launchpad:bug-1910403

I'm expecting the added test to fail with the stack in the bug 1910403 but it fails with the following stack:

getVerifiedSignature, handler.py:253
getVerifiedSignatureResilient, handler.py:147
_verifySignature, dscfile.py:190
parse, dscfile.py:153
parseChanges, changesfile.py:109
run_and_collect_errors, nascentupload.py:434
run_and_reject_on_error, nascentupload.py:445
process, nascentupload.py:145
_processUpload, uploadprocessor.py:538
processChangesFile, uploadprocessor.py:368
processUpload, test_uploadprocessor.py:337
testUploadWithoutMaintainerEmail, test_uploadprocessor.py:553
_run_test_method, testcase.py:723
_run_user, runtest.py:191
_run_core, runtest.py:144
_run_prepared_result, runtest.py:108
_run_one, runtest.py:94
run, runtest.py:80
run, testcase.py:675
__call__, case.py:673
run_tests, runner.py:396
run_layer, runner.py:474
run_tests, runner.py:293
run, runner.py:191
main, test.py:275
<module>, test:8

And the final exception (lp.services.gpg.interfaces.GPGVerificationError) is visible to the "user/developer/test runner" as :
[u"GPG verification of /tmp/tmpX1xckK/incoming/bar_1.0-1/bar_1.0-1_source.changes failed: (7, 8, u'Bad signature')"]

Not sure how we get from here to the exception stack in the Bug assessment.