Ensure that Users collection is always defined in App, fixes T242

Test Plan:
# login
# be on home page, or refresh on home page
# click Workspace
# click Edit Profile under your avatar
# click the modal close button

Reviewers: dkobia, rjmackay

Reviewed By: rjmackay

Subscribers: PapaLee, lkamau, eyedol

Maniphest Tasks: T242

Differential Revision: https://phabricator.ushahidi.com/D102