Dashboard: handle the case where refresh_intervals could be null (#35511) (#35579)

* handle the case where refresh_intervals === null + add unit test

* have a clean _dashboard for each test

* modify check to see if refresh_intervals is an array

(cherry picked from commit 60f79a3548)

Co-authored-by: Ashley Harrison <ashharrison90@gmail.com>

public/app/features/dashboard/services/TimeSrv.test.ts

@@ -11,17 +11,17 @@ jest.mock('app/core/core', () => ({
 
 describe('timeSrv', () => {
   let timeSrv: TimeSrv;
-
-  const _dashboard: any = {
-    time: { from: 'now-6h', to: 'now' },
-    getTimezone: jest.fn(() => 'browser'),
-    timeRangeUpdated: jest.fn(() => {}),
-  };
+  let _dashboard: any;
 
   beforeEach(() => {
+    _dashboard = {
+      time: { from: 'now-6h', to: 'now' },
+      getTimezone: jest.fn(() => 'browser'),
+      refresh: false,
+      timeRangeUpdated: jest.fn(() => {}),
+    };
     timeSrv = new TimeSrv(new ContextSrvStub() as any);
     timeSrv.init(_dashboard);
-    _dashboard.refresh = false;
   });
 
   describe('timeRange', () => {
@@ -130,6 +130,17 @@ describe('timeSrv', () => {
       expect(timeSrv.time.to).toEqual('now');
     });
 
+    it('should handle refresh_intervals=null when refresh is enabled', () => {
+      locationService.push('/d/id?refresh=30s');
+
+      timeSrv = new TimeSrv(new ContextSrvStub() as any);
+
+      _dashboard.timepicker = {
+        refresh_intervals: null,
+      };
+      expect(() => timeSrv.init(_dashboard)).not.toThrow();
+    });
+
     describe('data point windowing', () => {
       it('handles time window specfied as interval string', () => {
         locationService.push('/d/id?time=1410337645000&time.window=10s');

public/app/features/dashboard/services/TimeSrv.ts

@@ -156,7 +156,9 @@ export class TimeSrv {
     this.refresh = getRefreshFromUrl({
       params: paramsJSON,
       currentRefresh: this.refresh,
-      refreshIntervals: this.dashboard?.timepicker?.refresh_intervals,
+      refreshIntervals: Array.isArray(this.dashboard?.timepicker?.refresh_intervals)
+        ? this.dashboard?.timepicker?.refresh_intervals
+        : undefined,
       isAllowedIntervalFn: this.contextSrv.isAllowedInterval,
       minRefreshInterval: config.minRefreshInterval,
     });