Fixed issue where a metric request error would set panel error flag, which would…

Fixed issue where a metric request error would set panel error flag, which would cause unsaved changes service to detect change, and prompt the unsaved changes warning. The panel error state is now moved to the panelMeta object that is not part of the dashboard / panel model, Closes #745

src/app/directives/grafanaPanel.js

@@ -18,8 +18,8 @@ function (angular, $) {
        '<div class="row-fluid panel-extra">' +
           '<div class="panel-extra-container">' +
             '<span class="alert-error panel-error small pointer"' +
-                  'config-modal="app/partials/inspector.html" ng-if="panel.error">' +
-              '<span data-placement="right" bs-tooltip="panel.error">' +
+                  'config-modal="app/partials/inspector.html" ng-if="panelMeta.error">' +
+              '<span data-placement="right" bs-tooltip="panelMeta.error">' +
               '<i class="icon-exclamation-sign"></i><span class="panel-error-arrow"></span>' +
               '</span>' +
             '</span>' +

src/app/panels/graph/module.js

@@ -209,7 +209,7 @@ function (angular, app, $, _, kbn, moment, TimeSeries) {
         .then($scope.dataHandler)
         .then(null, function(err) {
           $scope.panelMeta.loading = false;
-          $scope.panel.error = err.message || "Timeseries data request error";
+          $scope.panelMeta.error = err.message || "Timeseries data request error";
           $scope.inspector.error = err;
           $scope.render([]);
         });

src/app/services/panelSrv.js

@@ -95,7 +95,7 @@ function (angular, _) {
         $scope.datasource = datasourceSrv.get(datasource);
 
         if (!$scope.datasource) {
-          $scope.panel.error = "Cannot find datasource " + datasource;
+          $scope.panelMeta.error = "Cannot find datasource " + datasource;
           return;
         }
       };
@@ -129,7 +129,7 @@ function (angular, _) {
         $scope.get_data = function() {
           if ($scope.otherPanelInFullscreenMode()) { return; }
 
-          delete $scope.panel.error;
+          delete $scope.panelMeta.error;
           $scope.panelMeta.loading = true;
 
           panel_get_data();

src/app/services/unsavedChangesSrv.js

@@ -81,7 +81,6 @@ function(angular, _, config) {
 
       // ignore timespan changes
       current.time = original.time = {};
-
       current.refresh = original.refresh;
 
       var currentTimepicker = _.findWhere(current.nav, { type: 'timepicker' });