Remove update hook to prevent infinite loop

app/assets/javascripts/monitoring/components/date_time_picker/date_time_picker.vue

@@ -58,9 +58,6 @@ export default {
   mounted() {
     this.verifyTimeRange();
   },
-  updated() {
-    this.verifyTimeRange();
-  },
   methods: {
     activeTimeWindow(key) {
       return this.timeWindows[key] === this.selectedTimeWindowText;

spec/frontend/monitoring/components/date_time_picker/date_time_picker_spec.js

@@ -51,6 +51,16 @@ describe('DateTimePicker', () => {
     });
   });
 
+  it('renders dropdown without a selectedTimeWindow set', done => {
+    createComponent({
+      selectedTimeWindow: {}
+    });
+    dateTimePicker.vm.$nextTick(() => {
+      expect(dateTimePicker.findAll('input').length).toBe(2);
+      done();
+    });
+  });
+
   it('renders inputs with h/m/s truncated if its all 0s', done => {
     createComponent({
       selectedTimeWindow: {