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

[Sarah Hoffmann]

When adding objects call output backends only when there
are any tags. Only works for the initial import. When updating
data, all objects need to be forwarded in case they need to
be deleted. That also means that output backends still must
be able to handle untagged objects.

Fixes #706.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/815

-- Commit Summary --

  * Skip output for untagged objects

-- File Changes --

    M osmdata.cpp (23)
    M tests/test-parse-xml2.cpp (8)
    M tests/test_output_multi_line_storage.osm (3)
    M tests/test_output_multi_poly_trivial.osm (3)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/815.patch
https://github.com/openstreetmap/osm2pgsql/pull/815.diff

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