docs: public FieldMetadata getEmptyField(FieldMetadata fieldMetadata) {
  		ValidationSession session = fieldMetadata.getValidationSession();
          RuleSessionImpl ruleSession = getRuleSession(session);
          ProxyField proxyField = session.getProxyField(fieldMetadata);
          RuleProxyField ruleProxyField = ruleSession.getRuleProxyField(proxyField);
          while (true)
          {
          	RuleProxyField rpf = ruleProxyField.backChain();
          	if (rpf == null)
          	{
          		// there are no unfilled fields
          		return null;
          	}
          	else
          	{
          		// We got an unfilled field return it
          		return rpf.getProxyField().getFieldMetadata();
          	}
          }
  	}