Do not drop POIs without name

[rinigus]

Originally from rinigus/osmscout-server#228

@palbr:

As mentioned in https://talk.maemo.org/showthread.php?p=1539764&postcount=119, OSM Scout Server drops OSM POIs, which do not have a name.

This will delete many POIs (which are interesting for me) like parking lots, public toilets or playgrounds, since those typically do not have special names.

Example: Looking at the parkings lots in my home town, I see the following POI search results:

• OsmAnd: 3 parkings lots with names and 25 parking lots without a name
• PoorMap with OSM Scout Server: only the 3 parking lots with names

Could you please remove this filter criterion?

[rinigus]

With e7eec63 I have added support for POIs without name. This was done by:

• making specific libosmscout importer that allows POIs without names (rinigus/libosmscout@7f34b19)

• adding whitelist of POI types that are imported without names as well (https://github.com/rinigus/geocoder-nlp/blob/master/importer/stylesheet/whitelist)

• if an empty name is specified, its indicated by leaving it blank in the return string

The fix will be released as a part of the next map import and osm scout server release

[rinigus]

While this issue is resolved, we'll have to go through white listed types. You could either open a new issue or suggest them here - whatever is easier.