fix(datepicker): Render empty string instead of false

mentioned in commit fd00b09e

mentioned in merge request status-page!631 (merged)

mentioned in merge request gitlab!102435 (merged)

mentioned in merge request gitlab-docs!3225 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3109 (merged)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!87 (merged)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!89 (merged)

mentioned in merge request gitlab!102896 (merged)

mentioned in merge request status-page!633 (merged)

mentioned in merge request gitlab-docs!3249 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3124 (merged)