Event detail view of Calendar events with no invitees should show "None" in the Properties column.
Summary: Ref T8020, Event detail view of Calendar events with no invitees should show "None" in the Properties column.
Test Plan: Open event, edit event to have no invitees, save, event detail view should show "None" in the Invitee section of the Properties column
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: Korvin, epriestley
Maniphest Tasks: T8020
Differential Revision: https://secure.phabricator.com/D12718