[Tile-serving] [openstreetmap/osm2pgsql] Ensure that the result of geom::simplify() is a valid geom or null (PR #1722)

[Jochen Topf]

The simplification function can generate a linestring with a single
point in it, which wouldn't be a line any more. Return a null geometry
in that case.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1722

-- Commit Summary --

  * Ensure that the result of geom::simplify() is a valid geom or null

-- File Changes --

    M src/geom-functions.cpp (3)
    M tests/test-geom-linestrings.cpp (41)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1722.patch
https://github.com/openstreetmap/osm2pgsql/pull/1722.diff

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