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Current LDAP support is based on active directory. I have to connect with a Sun iPlanet based LDAP server with no group definition. A user should be able to specify BaseDN and filter string for LDAP to search for a user.
In Hue, you can currently import users by DN, or perform a search against a BaseDN. Group definitions are not required to import users. Though, if you try to import by DN, then there's a check to make sure that DN is within the configured BaseDN.
The config parameters you are looking for are 'user_filter' and 'base_dn'.