Fix client crashing because users object is missing

...ton-html5/imports/ui/components/actions-bar/container.jsx

.../imports/ui/components/audio/audio-controls/container.jsx

...tton-html5/imports/ui/components/chat/alert/container.jsx

bigbluebutton-html5/imports/ui/components/chat/component.jsx

bigbluebutton-html5/imports/ui/components/chat/container.jsx

...s/ui/components/components-data/users-context/context.jsx

.../imports/ui/components/lock-viewers/context/container.jsx

...ebutton-html5/imports/ui/components/nav-bar/container.jsx

...on-html5/imports/ui/components/presentation/container.jsx

...html5/imports/ui/components/status-notifier/container.jsx

...s/ui/components/user-list/user-list-content/container.jsx

...ents/user-list/user-list-content/user-notes/container.jsx

...5/imports/ui/components/waiting-users/alert/container.jsx