[Tile-serving] [osm2pgsql] Ignore nodes with invalid coordinates. (#455)

[Jochen Topf]

@pnorman: @zerebubuth is right. This is why I specifically added this `valid()` function, so the user can decide what to do with the messed up data. (This is one of the many strange corner cases you run into with OSM data that's unfortunately not documented anywhere.) 

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