message: Don't show left pane for guests.
diff: 'is-client-offline': Connection.isClientOffline,
  'left-pane-visible': isLeftPaneVisible,
  'right-pane-visible': isRightPaneVisible,
  - 'has-left-pane': Screen.isLg && isLeftPaneSticky,
  + 'has-left-pane': app.user && Screen.isLg && isLeftPaneSticky,
  'has-minibar': hasMinibar,
  'has-banner': hasBanner,
  }"
  