[Tile-serving] [openstreetmap/osm2pgsql] Avoid crashing on out-of-range inputs for int4 columns (#956)

[Andy Allan]

> Nice tests. Do you mind adding them as an additional test to osm2pgsql directly with this PR? You can use `tests/test-output-pgsql-z_order.cpp` as an example.

I've added some tests too. I didn't see an existing way to test for null integer responses, so I used string comparison with an empty string instead.

Let's see how the CI gets on!

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