message: fix(dashboard): user id can be null when there is an anonymous user
diff: @@ -335,7 +335,7 @@ export const hydrateDashboard = (dashboardData, chartData) => (
  dashboardInfo: {
  ...dashboardData,
  metadata,
  - userId: String(user.userId), // legacy, please use state.user instead
  + userId: user.userId ? String(user.userId) : null, // legacy, please use state.user instead
  dash_edit_perm: canEdit,
  dash_save_perm: findPermission('can_save_dash', 'Superset', roles),
  dash_share_perm: findPermission(
  