Test object is assigned using optional chaining but previously did not
check that any value had actually been assigned which would cause the
`getStart` call to fail resulting in a failed migration.
## Current Behavior
Migration fails if no matching test object is found.
## Expected Behavior
Migration should not fail.
## Related Issue(s)
I haven't opened an issue, just the PR. I can open an issue if required
for tracking.
8fd38cba9a