[Tile-serving] [osm2pgsql] Cleanup based on the output of LLVM's static analyzer (#299)

[Sarah Hoffmann]

>          int nodec;
>  
> +        assert(ndc > 0 && "no nodes to proccess");

The current code actually produces empty geometries for 0-node ways. Simply ignoring them might leave zombies when running in append mode. Better to dump empty ways at the very beginning of the function as follows:
~~~
  if (ndc <= 0) {
    delete_unused_full('W', id);
    return 0;
  }
~~~

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/299/files#r25124866
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