[Tile-serving] [openstreetmap/osm2pgsql] Fix parsing of command line option "-e 12" (no expiry maxzoom given) (#832)

[Michael Reichert]

@Nakaner pushed 1 commit.

8a2038e  improve error messages


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View it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/832/files/6eae9e133a77bbc9d62e83db1d27688d90901112..8a2038e85d91a9c94784ab694fcc00dac6784704
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