[SSSD] [PATCH] SSSD fails to store users if any of the requested attribute is empty.

[Michal Židek]

https://fedorahosted.org/sssd/ticket/1440

Looks like some LDAP servers are able to store empty attribute values. 
For some servers it results in syntax error, so it is probably a rare 
case (if not an error) to have such values. LDB seems to be unable to 
handle such values too, so in this patch we skip empty values and do not 
store them to local cache.

Patch is attached.

Thanks
Michal