Closes #390 - Put a check in to see if the gridmap has a length greater then zero

Author: simianhacker

src/kibana/apps/dashboard/directives/grid.js

@@ -190,7 +190,10 @@ define(function (require) {
           g.generate_stylesheet({ namespace: '.gridster' });
 
           g.get_widgets_from_DOM();
-          g.set_dom_grid_height();
+          // We can't call this method if the gridmap is empty. This was found
+          // when the user double clicked the "New Dashboard" icon. See
+          // https://github.com/elasticsearch/kibana4/issues/390
+          if (gridster.gridmap.length > 0) g.set_dom_grid_height();
           g.drag_api.set_limits(COLS * g.min_widget_width);
         };
 
@@ -200,11 +203,12 @@ define(function (require) {
           readGridsterChangeHandler();
           complete();
         };
+
         var safeLayout = _.debounce(layout, 200);
 
         init();
       }
     };
   });
 
-});
+});