variable name error

The variable name --- `dist` error
`dist` = {}  will cover `dist = grades.answer_distributions(course.id)`
Update AUTHORS
Update AUTHORS
Fix get_courses to handle inflight changes
more rigorously.
Adding a number of logging messages for verification process.
Track upsell copy interaction, upgrade button and verify now button clicks on the dashboard
Update virtual pageview event categories, general polish
Merge pull request #6329 from edx/dhm/bug_split_index

Fix get_courses to handle inflight changes
Merge pull request #6244 from wwj718/patch-1

variable name error
ECOM-759  if course is none return 404 error code.
Merge pull request #6326 from edx/renzo/split-verification-dashboard-analytics

Split verification dashboard analytics
Merge pull request #6323 from edx/awais786/ECOM-759

ECOM-759  if course is none return 404 error code.
Merge pull request #6327 from edx/sanchez/logging-verified-split

Adding a number of logging messages for verification process.
Add Jasmine tests for the payment/verification flow.