Improve wording of connection error messages, e.g. to indicate a blank search user/pass, to help admins resolve issues

Hi,

I'm currently having problems with LDAP authentication which are being made just that bit more frustrating because the error messages being logged to watchdog are a bit confusing, for example, the comment here explains that the LDAP data connection problem might be because of no/incorrect username/password, but the error message is generic (In ldapdata.module, function _ldapdata_edition()):

    //blank username - log to watchdog in case the admin doesn't realise their LDAP Data has no user/pass
    watchdog('ldapdata', "User data synchronisation: : user %name's data could not be read in the LDAP directory", array('%name' => $user->name), WATCHDOG_WARNING);

I realise this might seem like a minor issue, but this is probably the first (and sometimes the only) error message an administrator has to go on when diagnosing problems with LDAP authorisation.

Thanks in advance for any help anyone can provide with this!

Best regards,

Alex