code: private void addRemoteCandidates(List<TransportCandidate> rc) {
          if (rc != null) {
              if (rc.size() > 0) {
                  for (TransportCandidate aRc : rc) {
                      addRemoteCandidate(aRc);
                  }
              }
          }
      }
docs: Add an offered remote candidate. The transport candidate can be unusable:
  we must check if we can use it.
  
  @param rc the remote candidate to add.