Don't let run_tests fail because grep fails to find a shadowed variable
Don't let run_tests fail because grep fails to find a shadowed variable

Summary:
Missed this the first time because I tested it when we _did_ have a failure for
grep to find.

Test Plan: See what happens in Changes

Reviewers: anupc

Reviewed By: anupc

Subscribers: changesbot, mkedia, anupc

Differential Revision: https://tails.corp.dropbox.com/D134308

dropbox/changes-client,dropbox/changes-client