docs: public Set<String> getAccountAttributes() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException  {
          if (info == null) {
              getRegistrationInfo();
          }
          Map<String, String> attributes = info.getAttributes();
          if (attributes != null) {
              return Collections.unmodifiableSet(attributes.keySet());
          } else {
              return Collections.emptySet();
          }
      }