Revision 1696953

Fix for LDAPAPI-246 : when a Modify operation that replace an attribute with no value is presentign a LDIF file, we don't create a empty value :

replace: url
-

is generated instead of :

replace: url
url:
-

The second form is used to inject null value into an attribute, when it's allowed.

For the same reason, the LdifEntry.toString() method now correctly generates the same thing.