[Tile-serving] [openstreetmap/osm2pgsql] Shouldn't be an empty style file allowed when using the parameter --hstore-all? (#915)

[tb]

> > Am i thinking wrong here?
> 
> Yes.
> 
> With no style file, osm2pgsql will have no idea of what is a polygon or not. For space reasons, you will also want to have some tags deleted. That's why there's [empty.style](https://github.com/openstreetmap/osm2pgsql/blob/master/empty.style) which is a starting point for a style where hstore is the primary storage of tags.

Hm, what about: a way is either closed (so it is a polygon), or not (so it is a line)?
And space is not an issue - otherwise the analysis would be wrong right from start ;)

Thanks for pointing me to the style file, i'm playing with it now (it seems to have an inconsistency with the special "osm_" tags, but this will go into another issue if it "stays alive" until tomorrow).

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