LDAP Modifications for better performance in PloneLDAP

security.declareProtected(manage_users, 'getGroupedUsers')
def getGroupedUsers(self, groups=None):
    """ Return all those users that are in a group """
    all_dns = {}
    users = []
    member_attrs = list(Set(GROUP_MEMBER_MAP.values()))
    
    if groups is None:
        groups = self.getGroups()
    
    for group_id, group_dn in groups:
        group_details = self.getGroupDetails(group_id)
    for key, vals in group_details:
        if key in member_attrs or key == '':
        # If the key is an empty string then the groups are
        # stored inside the user folder itself.
        for dn in vals:
            all_dns[dn] = 1
    
    for dn in all_dns.keys():
        # Only attempt to retrieve the user if their DN
        # matches the Users Base DN
        +if not dn.count(self.users_base):
        +   user = None
        +else:
            try:
                user = self.getUserByDN(dn)
            except:
                user = None
        if user is not None:
            users.append(user.__of__(self))
    return tuple(users)