[Tile-serving] [osm2pgsql] Funny output for empty changeset (#468)

[alex85k]

By the way, by fixing format we can fix the last warning on MacOS 
https://travis-ci.org/openstreetmap/osm2pgsql/jobs/86858232
and add ``-Werror`` flag for it on Travis.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/468#issuecomment-150278137
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