[Tile-serving] [openstreetmap/osm2pgsql] Confusing error when database parameter is missing (#1400)

[Stephan]

Do I understand correctly, that the request is to first check whether the `postgis` extension is installed, before calling postgis functions?


Like:

```
postgres=# SELECT count(*) FROM pg_extension WHERE extname='postgis';
 count
-------
     1
(1 row)
```

And if not printing an error message?


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