code: @Override
  	public Optional<Link> findLinkWithRel(LinkRelation relation, String representation) {
  		return firstOrEmpty(findLinksWithRel(relation, representation));
  	}
docs: /*
  (non-Javadoc)
  @see org.springframework.hateoas.LinkDiscoverer#findLinkWithRel(org.springframework.hateoas.LinkRelation, java.lang.String)