add check for partial state loading (#378)

Author: just-at-uber

client/containers/domain-autocomplete/reducer.js

@@ -21,9 +21,10 @@
 
 import { migrateRecentDomains } from './helpers';
 
-const reducer = state => ({
-  ...state,
-  visitedDomainList: migrateRecentDomains(state.visitedDomainList),
-});
+const reducer = state =>
+  state && {
+    ...state,
+    visitedDomainList: migrateRecentDomains(state.visitedDomainList),
+  };
 
 export default reducer;

client/store/index.js

@@ -92,9 +92,15 @@ const getStoreConfig = ({ router, state }) => {
         return;
       }
 
+      const domainAutocomplete = domainAutocompleteReducer(
+        state.domainAutocomplete
+      );
+
       return {
         ...state,
-        domainAutocomplete: domainAutocompleteReducer(state.domainAutocomplete),
+        ...(domainAutocomplete && {
+          domainAutocomplete,
+        }),
       };
     },
     storage: window.localStorage,