[NOREF] - Fixed task list last updated (#657)

* Added filter for null check before comparing time

* Added unit test

* Reduce requires array with length, added check

src/views/ModelPlan/TaskList/index.test.tsx

@@ -10,7 +10,7 @@ import GetModelPlanQuery from 'queries/GetModelPlan';
 import { GetModelPlan_modelPlan as GetModelPlanTypes } from 'queries/types/GetModelPlan';
 import { ModelStatus } from 'types/graphql-global-types';
 
-import TaskList from './index';
+import TaskList, { getLatestModifiedDate } from './index';
 
 describe('The Model Plan Task List', () => {
   const mockStore = configureMockStore();
@@ -117,6 +117,30 @@ describe('The Model Plan Task List', () => {
     ).toBeInTheDocument();
   });
 
+  it('gets the last modified date of it solutions', async () => {
+    const expectedDate: string = '2023-05-21T13:38:11.998962Z';
+
+    const lastUpdated = getLatestModifiedDate([
+      {
+        __typename: 'OperationalNeed',
+        id: '724c19ce-0309-4f04-a4fe-d9ed345dbec',
+        modifiedDts: null
+      },
+      {
+        __typename: 'OperationalNeed',
+        id: '864c19ce-0309-4f04-a4fe-d9ed844edbec',
+        modifiedDts: '2023-04-01T13:38:11.998962Z'
+      },
+      {
+        __typename: 'OperationalNeed',
+        id: '134c19ce-0309-4f04-a4fe-d9ed844edbec',
+        modifiedDts: '2023-05-21T13:38:11.998962Z'
+      }
+    ]);
+
+    expect(lastUpdated).toEqual(expectedDate);
+  });
+
   it('displays the model plan task list steps', async () => {
     modelPlan.modelName = '';
     render(

src/views/ModelPlan/TaskList/index.tsx

@@ -95,6 +95,20 @@ const taskListSectionMap: TaskListSectionMapType = {
   prepareForClearance: TaskListSection.PREPARE_FOR_CLEARANCE
 };
 
+export const getLatestModifiedDate = (
+  operationalNeedsArray: OperationalNeedsType[]
+) => {
+  const updatedNeeds = operationalNeedsArray.filter(need => need.modifiedDts);
+
+  if (updatedNeeds.length !== 0) {
+    return updatedNeeds.reduce((a, b) =>
+      a.modifiedDts! > b.modifiedDts! ? a : b
+    ).modifiedDts;
+  }
+
+  return null;
+};
+
 const TaskList = () => {
   const { t } = useTranslation('modelPlanTaskList');
   const { t: h } = useTranslation('draftModelPlan');
@@ -152,17 +166,6 @@ const TaskList = () => {
     return inProgress ? TaskStatus.IN_PROGRESS : TaskStatus.READY;
   };
 
-  const getLatestModifiedDate = (
-    operationalNeedsArray: OperationalNeedsType[]
-  ) => {
-    if (operationalNeedsArray.length !== 0) {
-      return operationalNeedsArray.reduce((a, b) =>
-        a.modifiedDts! > b.modifiedDts! ? a : b
-      ).modifiedDts;
-    }
-    return null;
-  };
-
   const itSolutions: ITSolutionsType = {
     modifiedDts: getLatestModifiedDate(operationalNeeds),
     status: getITSolutionsStatus(operationalNeeds)