fix(graph): fixed issue with duplicate metric calls when doing full page reload…

fix(graph): fixed issue with duplicate metric calls when doing full page reload of  graph in edit/view mode

public/app/plugins/panel/graph/graph.js

@@ -61,7 +61,6 @@ function (angular, $, moment, _, kbn, GraphTooltip, thresholdManExports) {
         ctrl.events.on('render', function(renderData) {
           data = renderData || data;
           if (!data) {
-            ctrl.refresh();
             return;
           }
           annotations = data.annotations || annotations;