title: Spring LdapTemplate method to test if entry exists?
body: <p>is there any method in Spring <code>LdapTemplate</code> that tests if an entry exists?</p>
  
  <p>I could do a search, but it seems clunky if I know the specific DN that I want to check for.  (My use case: checking referential integrity from a group entry to make sure the corresponding user DNs listed under <code>uniqueMember</code> actually exist.)</p>