[Tile-serving] [openstreetmap/osm2pgsql] Fix: Handle special single-geom case for multipoint/linestring (PR #1791)

[mboeringa]

@joto,

Just wondering: is there any technical reason to turn single point/linestring that should have been multi-variant, due to missing objects in e.g. a regional extract, into non-multi type geometries? 

"single point/linestring" multipoints and multilinestrings are still valid according to SF, aren't they, or am I wrong?

Of course, there is no real objection either to turn them into point/linestring instead, unless the geometry column's type was set to the multi-variant instead of generic geometry, in which case PostgreSQL would reject the insertion.

Maybe simply documenting this specific behavior on the osm2pgsql manual pages, would be enough to cover the implemented behavior.

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