D7750: run-tests: ensure the script exits when it fails to change directories

Closed by commit rHGbd3fa45c0662: run-tests: ensure the script exits when it fails to change directories (authored by mharbison72). This revision was automatically updated to reflect the committed changes. REPOSITORY rHG Mercurial CHANGES SINCE LAST UPDATE https://phab.mercurial-scm.org/D775

D7750: run-tests: ensure the script exits when it fails to change directories

mharbison72 created this revision. Herald added a subscriber: mercurial-devel. Herald added a reviewer: hg-reviewers. REVISION SUMMARY Caught by PyCharm as an unused variable assignment. This regressed in c496e8c14b9e