Fix typo in Roadmap sorting causing scrolling to fail on null dates (!9604) · Merge requests · GitLab.org / GitLab

What does this MR do?

Fixes a minor typo in Roadmap sorting which caused timeline scrolling to fail when start or end dates are null. This feature which the bug was affecting was introduced in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9018.

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