feat(alerting): make sure saved alerts are valid

pkg/services/alerting/dashboard_parser.go

@@ -65,7 +65,7 @@ func ParseAlertsFromDashboard(cmd *m.SaveDashboardCommand) []*m.AlertRule {
 				alert.DatasourceId = query.Result.Id
 			}
 
-			if alert.Query != "" {
+			if alert.ValidToSave() {
 				alerts = append(alerts, alert)
 			}
 		}

pkg/services/alerting/rule_reader.go

@@ -64,6 +64,7 @@ func (arr *AlertRuleReader) Fetch() []*AlertRule {
 		model.Description = ruleDef.Description
 		model.Aggregator = ruleDef.Aggregator
 		model.State = ruleDef.State
+		model.QueryRange = ruleDef.QueryRange
 		res[i] = model
 	}