Merge pull request #574 from jirkait/master

fix Not null value assert in LdapNameBuilder.add()

core/src/main/java/org/springframework/ldap/support/LdapNameBuilder.java

@@ -82,7 +82,7 @@ public final class LdapNameBuilder {
      */
     public LdapNameBuilder add(String key, Object value) {
         Assert.hasText(key, "key must not be blank");
-        Assert.notNull(key, "value must not be null");
+        Assert.notNull(value, "value must not be null");
 
         try {
             ldapName.add(new Rdn(key, value));