[Tile-serving] [openstreetmap/osm2pgsql] Skip output for untagged objects (#815)

[Paul Norman]

> Import time for node is approx. half with this change and there is no significant difference for ways and relations (as excepted). Given that node processing makes up a rather small part of the processing time, the overall gain is in the order of 1%

This probably depends significantly on the overall speed of the machine, on faster machines nodes take up more time relative to ways and relations.

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