Fix exceptions and layout size when panels change

bigbluebutton-html5/imports/ui/components/app/styles.scss

...tton-html5/imports/ui/components/breakout-room/service.js

...imports/ui/components/chat/alert/push-alert/component.jsx

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

bigbluebutton-html5/imports/ui/components/layout/context.jsx

...ton-html5/imports/ui/components/layout/layout-manager.jsx

...i/components/media/webcam-draggable-overlay/component.jsx

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

...n-html5/imports/ui/components/panel-manager/component.jsx

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

...orts/ui/components/user-list/chat-list-item/component.jsx

...s/user-list/user-list-content/breakout-room/component.jsx

...rts/ui/components/video-provider/video-list/component.jsx