[Tile-serving] [openstreetmap/osm2pgsql] Guard against segfaults on expiry of empty diff (#614)

[Robert Marianski]

When applying an empty diff, the dirty pointer was empty and would segfault when trying to output_and_destroy.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/614

-- Commit Summary --

  * Guard against segfaults on expiry of empty diff

-- File Changes --

    M expire-tiles.cpp (3)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/614.patch
https://github.com/openstreetmap/osm2pgsql/pull/614.diff

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