[dashboard] cleanup quietly to prevent error

src/plugins/kibana/public/dashboard/directives/grid.js

@@ -83,14 +83,15 @@ app.directive('dashboardGrid', function ($compile, Notifier) {
         });
 
         $scope.$on('$destroy', function () {
+          safeLayout.cancel();
           $window.off('resize', safeLayout);
 
           if (!gridster) return;
           gridster.$widgets.each(function (i, el) {
             const panel = getPanelFor(el);
-            removePanel(panel);
             // stop any animations
             panel.$el.stop();
+            removePanel(panel, true);
             // not that we will, but lets be safe
             makePanelSerializeable(panel);
           });
@@ -125,9 +126,9 @@ app.directive('dashboardGrid', function ($compile, Notifier) {
       }
 
       // tell gridster to remove the panel, and cleanup our metadata
-      function removePanel(panel) {
+      function removePanel(panel, silent) {
         // remove from grister 'silently' (don't reorganize after)
-        gridster.remove_widget(panel.$el);
+        gridster.remove_widget(panel.$el, silent);
 
         // destroy the scope
         panel.$scope.$destroy();