I am using 2.8.4 version of the LDAP plugin in WPMU 2.8.4a which is great, thank you! However, our LDAP (like I assume many others) is not standard and has its own inconsistencies. Due to the way users are added to our LDAP system, not every person will have an email address. This is a problem for Wordpress since it is a required field.
FIX: LDAP plugin should validate that a value exists for each field that will be required by Wordpress in order to create an account. If a field is missing, an error message should be provided in the interface as to which field is missing. Currently a blank page with no error is generated and user is not added which is very confusing to people adding users.