[TECHNICAL SUPPORT] LPS-38625 Missing LDAP mapping properties cause NPE on import

Hi Marcellus,

we could fix this to get the pref value reading out from the load call, as it's at other places in the portal (I've found the MailServiceImpl class), however, I think we shouldn't put that overhead here. In addition, it's not necessary to get any value from the Properties there immediately.

Regards,
Zsigmond