Merge pull request #758 from hms-dbmi-cellenics/hotfix-experimentsLoa…

…ded-reducer

Hotfix experiments loaded reducer

src/__test__/redux/reducers/__snapshots__/experimentsReducer.test.js.snap

@@ -268,6 +268,18 @@ Object {
 }
 `;
 
+exports[`experimentsReducer Loads 0 experiments correctly 1`] = `
+Object {
+  "ids": Array [],
+  "meta": Object {
+    "activeExperimentId": undefined,
+    "error": false,
+    "loading": false,
+    "saving": false,
+  },
+}
+`;
+
 exports[`experimentsReducer Loads an experiment correctly 1`] = `
 Object {
   "experiment-1": Object {

src/__test__/redux/reducers/experimentsReducer.test.js

@@ -145,6 +145,18 @@ describe('experimentsReducer', () => {
     expect(newState).toMatchSnapshot();
   });
 
+  it('Loads 0 experiments correctly', () => {
+    const newState = experimentsReducer(initialState, {
+      type: EXPERIMENTS_LOADED,
+      payload: {
+        experiments: [],
+      },
+    });
+    expect(newState.ids).toEqual([]);
+    expect(newState.meta.activeExperimentId).toEqual(undefined);
+    expect(newState).toMatchSnapshot();
+  });
+
   it('Loading state changes meta state', () => {
     const newState = experimentsReducer(initialState, {
       type: EXPERIMENTS_LOADING,

src/redux/reducers/experiments/experimentsLoaded.js

@@ -17,7 +17,7 @@ const experimentsLoaded = produce((draft, action) => {
 
   const ids = _.map(experiments, 'id');
 
-  draft.meta.activeExperimentId = experiments[0].id;
+  draft.meta.activeExperimentId = experiments[0]?.id;
   draft.meta.loading = false;
   draft.ids = ids;