code: public Set<OpenPgpV4Fingerprint> getUndecidedFingerprints()
              throws IOException, PGPException {
          return getFingerprintsOfKeysWithState(getAnyPublicKeys(), OpenPgpTrustStore.Trust.undecided);
      }
docs: Return a {@link Set} of {@link OpenPgpV4Fingerprint}s of all keys of the contact, which have the trust state
  {@link OpenPgpStore.Trust#undecided}.
  
  @return undecided fingerprints
  
  @throws IOException IO error
  @throws PGPException PGP error