More correct fix - set default value array() for getParameter call.

Summary: Ref T8577, More correct fix - set default value array() for getParameter call.

Test Plan: Make sure saved queries like Month View, Day View, and Upcoming Events, still work.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T8577

Differential Revision: https://secure.phabricator.com/D13330