Investigate/add debug info for KeyError: attribution_code error/test failure

[stephendonner]

From time to time, we see the following KeyError: attribution_code failure/error:

From https://qa-preprod-master.fxtest.jenkins.stage.mozaws.net/job/stub-attribution/job/master/1084/console

15:34:41 
15:34:41 =================================== FAILURES ===================================
15:34:41 _ test_campaign_flow_param_values[google-paidsearch-Fake%20campaign-test term] _
15:34:41 [gw0] linux2 -- Python 2.7.13 /usr/local/bin/python
15:34:41 tests/test_campaign_flow.py:61: in test_campaign_flow_param_values
15:34:41     new_dict = breakout_utm_param_values(derived_url)
15:34:41 tests/test_campaign_flow.py:23: in breakout_utm_param_values
15:34:41     attribution_code = key_value_dict['attribution_code'][0].encode('utf-8')
15:34:41 E   KeyError: 'attribution_code'
15:34:41 ------------------------------- pytest-selenium --------------------------------
15:34:41 URL: https://www.allizom.org/en-US/firefox/download/thanks/
15:34:41 Sauce Labs Job: https://saucelabs.com/jobs/b1bedb528e5543a5b4e65e3976013899
15:34:41  generated xml file: /home/jenkins/workspace/stub-attribution_master-HSZMGT5RUDURFLDGHEIDP6CDEDC6SV7YGHL2LWY6PRFZ5CSAMPWA@2/results/junit.xml 
15:34:41  generated html file: /home/jenkins/workspace/stub-attribution_master-HSZMGT5RUDURFLDGHEIDP6CDEDC6SV7YGHL2LWY6PRFZ5CSAMPWA@2/results/index.html 
15:34:41 =========================== short test summary info============================
15:34:41 FAIL tests/test_campaign_flow.py::test_campaign_flow_param_values[google-paidsearch-Fake%20campaign-test term]
15:34:41 ===================== 1 failed, 2 passed in 17.19 seconds ======================

[stephendonner]

Even with --showlocals added in c2024a8#diff-58231b16fdee45a03a4ee3cf94a9f2c3R46, I can't seem to find the local-variable output in the Jenkins console.

[davehunt]

It could be that --tb=short is preventing the local variables from being shown?