Folder pages to redux (#13235)

* creating types, actions, reducer

* load teams and store in redux

* delete team

* set search query action and tests

* Teampages page

* team members, bug in fetching team

* flattened team state, tests for TeamMembers

* test for team member selector

* wip: began folder to redux migration

* team settings

* actions for group sync

* wip: progress on redux folder store

* wip: folder to redux

* wip: folder settings page to redux progress

* mobx -> redux: major progress on folder migration

* redux: moved folders to it's own features folder

* fix: added loading nav states

* fix: gofmt issues

* wip: working on reducer test

* fix: added reducer test

public/app/core/selectors/navModel.ts

@@ -15,7 +15,7 @@ function getNotFoundModel(): NavModel {
   };
 }
 
-export function getNavModel(navIndex: NavIndex, id: string): NavModel {
+export function getNavModel(navIndex: NavIndex, id: string, fallback?: NavModel): NavModel {
   if (navIndex[id]) {
     const node = navIndex[id];
     const main = {
@@ -33,7 +33,11 @@ export function getNavModel(navIndex: NavIndex, id: string): NavModel {
       node: node,
       main: main,
     };
-  } else {
-    return getNotFoundModel();
   }
+
+  if (fallback) {
+    return fallback;
+  }
+
+  return getNotFoundModel();
 }