docs: protected static void buildSignatureValidationFilterIfNeeded(final SamlRegisteredService service, final List<MetadataFilter> metadataFilterList) throws Exception {
          if (StringUtils.isBlank(service.getMetadataSignatureLocation())) {
              LOGGER.warn("No metadata signature location is defined for [{}], so SignatureValidationFilter will not be invoked", service.getMetadataLocation());
              return;
          }
          buildSignatureValidationFilterIfNeeded(service, metadataFilterList, service.getMetadataSignatureLocation());
      }