message: Clear topic messages locally
diff: @@ -38,6 +38,11 @@ const reducer = (state = initialState, action: Action): TopicMessagesState => {
  ...state,
  isFetching: action.payload,
  };
  + case getType(actions.clearMessagesTopicAction.success):
  + return {
  + ...state,
  + messages: [],
  + };
  default:
  return state;
  }
  