Failed karma spec

In https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/38488370:

Finished in 50.948 secs / 49.012 secs @ 00:00:28 GMT+0000 (UTC)

SUMMARY:
✔ 3679 tests completed
✖ 1 test failed

FAILED TESTS:
  Issue
    units
      initCloseReopenReport
        ✖ calls .initDroplab
          Chrome
        Uncaught TypeError: Cannot read property 'classList' of undefined thrown

/cc: @lbennett