[Tile-serving] [openstreetmap/osm2pgsql] Skip processing stage entirely when no objects are pending (#900)

[Sarah Hoffmann]

The processing stage opens quite a few connections to the database. This can be avoided when no objects are pending (i.e. when importing).

Improves on #885 and also happens to reduce the time for running the tests by 50%.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/900

-- Commit Summary --

  * Skip processing stage entirely when no objects are pending

-- File Changes --

    M osmdata.cpp (8)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/900.patch
https://github.com/openstreetmap/osm2pgsql/pull/900.diff

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