code: private Observable<ConversationComparison> lookForMissingEvents(final RxComapiClient client, ConversationComparison conversationComparison) {
  
          if (!conversationComparison.isSuccessful || conversationComparison.conversationsToUpdate.isEmpty()) {
              return Observable.fromCallable(() -> conversationComparison);
          }
  
          return synchroniseEvents(client, conversationComparison.conversationsToUpdate, new ArrayList<>())
                  .map(result -> {
                      if (conversationComparison.isSuccessful && !result) {
                          conversationComparison.addSuccess(false);
                      }
                      return conversationComparison;
                  });
      }
docs: Checks services for missing events in stored conversations.
  
  @param client                 Foundation client.
  @param conversationComparison Describes differences in local and remote conversation list.
  @return Observable returning unchanged argument to further processing.