Fix flow and lint

frontend/src/metabase/admin/permissions/containers/CollectionsPermissionsApp.jsx

@@ -19,7 +19,7 @@ import {
   savePermissions,
   loadPermissions,
 } from "../permissions";
-import { goBack, push } from "react-router-redux";
+import { push } from "react-router-redux";
 
 const mapStateToProps = (state, props) => {
   return {

frontend/src/metabase/admin/permissions/selectors.js

@@ -754,7 +754,7 @@ export const getCollectionsPermissionsGrid = createSelector(
             const collection = _.findWhere(collections, {
               id: collectionId,
             });
-            if (collection.children.length > 0) {
+            if (collection && collection.children.length > 0) {
               return [TogglePropagateAction];
             } else {
               return [];

frontend/test/internal/__snapshots__/components.unit.spec.js.snap

@@ -1021,7 +1021,7 @@ exports[`Styled(div) should render "with an icon" correctly 1`] = `
 
 exports[`Toggle should render "off" correctly 1`] = `
 <a
-  className="no-decoration "
+  className="no-decoration"
   onClick={null}
   style={
     Object {
@@ -1033,7 +1033,7 @@ exports[`Toggle should render "off" correctly 1`] = `
 
 exports[`Toggle should render "on" correctly 1`] = `
 <a
-  className="no-decoration undefined "
+  className="no-decoration"
   onClick={null}
   style={
     Object {