patch null blocked error

static/app-strings.json

@@ -1282,5 +1282,6 @@
   "Not Now": "Not Now",
   "Enter your phone number and we will send you a verification code. We will not share your phone number with third parties.": "Enter your phone number and we will send you a verification code. We will not share your phone number with third parties.",
   "Number": "Number",
+  "You can have more than one or remove this later.": "You can have more than one or remove this later.",
   "--end--": "--end--"
 }

ui/redux/reducers/blocked.js

@@ -29,9 +29,10 @@ export default handleActions(
       action: { data: { blocked: ?Array<string> } }
     ) => {
       const { blocked } = action.data;
+      const sanitizedBlocked = blocked && blocked.filter(e => typeof e === 'string');
       return {
         ...state,
-        blockedChannels: blocked && blocked.length ? blocked : state.blockedChannels,
+        blockedChannels: sanitizedBlocked && sanitizedBlocked.length ? sanitizedBlocked : state.blockedChannels,
       };
     },
   },

ui/redux/selectors/blocked.js

@@ -3,7 +3,9 @@ import { createSelector } from 'reselect';
 
 const selectState = (state: { blocked: BlocklistState }) => state.blocked || {};
 
-export const selectBlockedChannels = createSelector(selectState, (state: BlocklistState) => state.blockedChannels);
+export const selectBlockedChannels = createSelector(selectState, (state: BlocklistState) => {
+  return state.blockedChannels.filter(e => typeof e === 'string');
+});
 
 export const selectBlockedChannelsCount = createSelector(selectBlockedChannels, (state: Array<string>) => state.length);